<TextBox Name="txtName" />

<TextBox Text="{Binding Name}" />

using System.ComponentModel;

namespace SL5Tests
{
    public class MainPageModel : INotifyPropertyChanged
    {
        string _name;
        public string Name 
        {
            get { return _name; }
            set
            {
                if (_name == value) return;
                _name = value;
                raisePropertyChanged("Name");
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        void raisePropertyChanged(string propertyName)
        {
            var handler = PropertyChanged;
            if (handler == null) return;
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

namespace SL5Tests
{
    public class MainPageViewModel
    {
        public MainPageModel MainPageModelData { set; get; }
        public MainPageViewModel()
        {
            MainPageModelData = new MainPageModel();
            MainPageModelData.Name = "Test1";
        }
    }
}

<UserControl x:Class="SL5Tests.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:VM="clr-namespace:SL5Tests"
    mc:Ignorable="d" Language="fa"    
    d:DesignHeight="300" d:DesignWidth="400">
    <UserControl.Resources>
        <VM:MainPageViewModel x:Name="vmMainPageViewModel" />
    </UserControl.Resources>
    <Grid DataContext="{Binding Source={StaticResource vmMainPageViewModel}}"
          x:Name="LayoutRoot" 
          Background="White">
        <TextBox Text="{Binding 
                            MainPageModelData.Name, 
                            Mode=TwoWay, 
                            UpdateSourceTrigger=PropertyChanged}" />
    </Grid>
</UserControl>

<Button  Click="btnClick_Event">Last</Button>

<Button Command="{Binding GoLast}">Last</Button>  

<TextBox Name="txtName" />  

<TextBox Text="{Binding Name}" />  

<TextBox TextChanged="TextBox_TextChanged" />

<TextBox Text="{Binding 
                            MainPageModelData.Name, 
                            Mode=TwoWay, 
                            UpdateSourceTrigger=PropertyChanged}" />

using System.ComponentModel;

namespace SL5Tests
{
    public class MainPageViewModel
    {
        public MainPageModel MainPageModelData { set; get; }
        public MainPageViewModel()
        {
            MainPageModelData = new MainPageModel();
            MainPageModelData.Name = "Test1";
            MainPageModelData.PropertyChanged += MainPageModelDataPropertyChanged;
        }

        void MainPageModelDataPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            switch (e.PropertyName)
            {
                case "Name":
                    //do something
                    break;
            }
        }
    }
}

using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace SL5Tests
{
    public static class InputBindingsManager
    {
        public static readonly DependencyProperty UpdatePropertySourceWhenEnterPressedProperty
                    = DependencyProperty.RegisterAttached(
                                "UpdatePropertySourceWhenEnterPressed",
                                typeof(bool),
                                typeof(InputBindingsManager),
                                new PropertyMetadata(false, OnUpdatePropertySourceWhenEnterPressedPropertyChanged));

        static InputBindingsManager()
        { }

        public static void SetUpdatePropertySourceWhenEnterPressed(DependencyObject dp, bool value)
        {
            dp.SetValue(UpdatePropertySourceWhenEnterPressedProperty, value);
        }

        public static bool GetUpdatePropertySourceWhenEnterPressed(DependencyObject dp)
        {
            return (bool)dp.GetValue(UpdatePropertySourceWhenEnterPressedProperty);
        }

        private static void OnUpdatePropertySourceWhenEnterPressedPropertyChanged(DependencyObject dp, 
    DependencyPropertyChangedEventArgs e)
        {
            var txt = dp as TextBox;
            if (txt == null)
                return;

            if ((bool)e.NewValue)
            {
                txt.KeyDown += HandlePreviewKeyDown;
            }
            else
            {
                txt.KeyDown -= HandlePreviewKeyDown;
            }
        }

        static void HandlePreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key != Key.Enter) return;

            var txt = sender as TextBox;
            if (txt == null)
                return;

            var binding = txt.GetBindingExpression(TextBox.TextProperty);
            if (binding == null) return;
            binding.UpdateSource();
        }
    }
}

<UserControl x:Class="SL5Tests.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:VM="clr-namespace:SL5Tests"
    mc:Ignorable="d" Language="fa"    
    d:DesignHeight="300" d:DesignWidth="400">
    <UserControl.Resources>
        <VM:MainPageViewModel x:Name="vmMainPageViewModel" />
    </UserControl.Resources>
    <Grid DataContext="{Binding Source={StaticResource vmMainPageViewModel}}"
          x:Name="LayoutRoot" 
          Background="White">
        <TextBox Text="{Binding 
                            MainPageModelData.Name, 
                            Mode=TwoWay, 
                            UpdateSourceTrigger=Explicit}"
                 VerticalAlignment="Top"
                 VM:InputBindingsManager.UpdatePropertySourceWhenEnterPressed="True"  />
    </Grid>
</UserControl>

using System.ComponentModel;

namespace SplittingViewsInMvvm.Models
{
    public class GuiModel : INotifyPropertyChanged
    {
        string _name;
        public string Name
        {
            get { return _name; }
            set
            {
                _name = value;
                raisePropertyChanged("Name");
            }
        }

        string _lastName;
        public string LastName
        {
            get { return _lastName; }
            set
            {
                _lastName = value;
                raisePropertyChanged("LastName");
            }
        }

        #region INotifyPropertyChanged Members
        public event PropertyChangedEventHandler PropertyChanged;
        void raisePropertyChanged(string propertyName)
        {
            var handler = PropertyChanged;
            if (handler == null) return;
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
        #endregion
    }
}

using SplittingViewsInMvvm.Models;

namespace SplittingViewsInMvvm.ViewModels
{
    public class MainViewModel
    {
        public GuiModel GuiModelData { set; get; }

        public MainViewModel()
        {
            GuiModelData = new GuiModel();
            GuiModelData.Name = "Name";
            GuiModelData.LastName = "LastName";
        }
    }
}

<UserControl x:Class="SplittingViewsInMvvm.Views.Main"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             xmlns:VM="clr-namespace:SplittingViewsInMvvm.ViewModels"
             d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.Resources>
        <VM:MainViewModel x:Key="vmMainViewModel" />
    </UserControl.Resources>
    <StackPanel DataContext="{Binding Source={StaticResource vmMainViewModel}}">
        <GroupBox Margin="2" Header="Group 1">
            <TextBlock Text="{Binding GuiModelData.Name}" />
        </GroupBox>
        <GroupBox Margin="2" Header="Group 2">
            <TextBlock Text="{Binding GuiModelData.LastName}" />
        </GroupBox>
    </StackPanel>
</UserControl>

<UserControl x:Class="SplittingViewsInMvvm.Views.Group1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <GroupBox Margin="2" Header="Group 1">
            <TextBlock Text="{Binding GuiModelData.Name}" />
        </GroupBox>
    </Grid>
</UserControl>

<UserControl x:Class="SplittingViewsInMvvm.Views.Group2"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <GroupBox Margin="2" Header="Group 2">
            <TextBlock Text="{Binding GuiModelData.LastName}" />
        </GroupBox>
    </Grid>
</UserControl>

<UserControl x:Class="SplittingViewsInMvvm.Views.Main"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             xmlns:V="clr-namespace:SplittingViewsInMvvm.Views"
             xmlns:VM="clr-namespace:SplittingViewsInMvvm.ViewModels"
             d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.Resources>
        <VM:MainViewModel x:Key="vmMainViewModel" />
    </UserControl.Resources>
    <StackPanel DataContext="{Binding Source={StaticResource vmMainViewModel}}">
        <V:Group1 />
        <V:Group2 />
    </StackPanel>
</UserControl>

<UserControl x:Class="SplittingViewsInMvvm.Views.Main"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             xmlns:V="clr-namespace:SplittingViewsInMvvm.Views"
             xmlns:VM="clr-namespace:SplittingViewsInMvvm.ViewModels"
             d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.Resources>
        <VM:MainViewModel x:Key="vmMainViewModel" />
    </UserControl.Resources>
    <StackPanel DataContext="{Binding Source={StaticResource vmMainViewModel}}">
        <V:Group1 DataContext="{Binding}" />
        <V:Group2 DataContext="{Binding}"/>
    </StackPanel>
</UserControl>

A 'Binding' cannot be set on the 'Source' property of type 'WebBrowser'.
A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

using System;
using System.Windows;
using System.Windows.Controls;

namespace WebBrowserSample.Behaviors
{
    public static class WebBrowserBehaviors
    {
        public static readonly DependencyProperty BindableSourceProperty =
            DependencyProperty.RegisterAttached("BindableSource",
                            typeof(object),
                            typeof(WebBrowserBehaviors),
                            new UIPropertyMetadata(null, BindableSourcePropertyChanged));

        public static object GetBindableSource(DependencyObject obj)
        {
            return (string)obj.GetValue(BindableSourceProperty);
        }

        public static void SetBindableSource(DependencyObject obj, object value)
        {
            obj.SetValue(BindableSourceProperty, value);
        }

        public static void BindableSourcePropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            WebBrowser browser = o as WebBrowser;
            if (browser == null) return;

            Uri uri = null;

            if (e.NewValue is string)
            {
                var uriString = e.NewValue as string;
                uri = string.IsNullOrWhiteSpace(uriString) ? null : new Uri(uriString);
            }
            else if (e.NewValue is Uri)
            {
                uri = e.NewValue as Uri;
            }

            if (uri != null) browser.Source = uri;
        }
    }
}

using System;
using System.ComponentModel;

namespace WebBrowserSample.ViewModels
{
    public class MainWindowViewModel : INotifyPropertyChanged
    {
        Uri _sourceUri;
        public Uri SourceUri
        {
            get { return _sourceUri; }
            set
            {
                _sourceUri = value;
                raisePropertyChanged("SourceUri");
            }
        }

        public MainWindowViewModel()
        {
            SourceUri = new Uri(@"C:\path\arrow.png");
        }

        #region INotifyPropertyChanged Members
        public event PropertyChangedEventHandler PropertyChanged;
        void raisePropertyChanged(string propertyName)
        {
            var handler = PropertyChanged;
            if (handler == null) return;
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
        #endregion
    }
}

<Window x:Class="WebBrowserSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:VM="clr-namespace:WebBrowserSample.ViewModels"
        xmlns:B="clr-namespace:WebBrowserSample.Behaviors"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <VM:MainWindowViewModel x:Key="vmMainWindowViewModel" />
    </Window.Resources>
    <Grid DataContext="{Binding Source={StaticResource vmMainWindowViewModel}}">
        <WebBrowser B:WebBrowserBehaviors.BindableSource="{Binding SourceUri}" />
    </Grid>
</Window>

<UserControl x:Class="MvvmLight6.Views.Menu"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
   xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
   xmlns:vm="clr-namespace:MvvmLight6.ViewModels" mc:Ignorable="d"
   FlowDirection="RightToLeft" d:DesignHeight="300" d:DesignWidth="400">
   <UserControl.Resources>
       <vm:MenuViewModel x:Key="vmMenuViewModel" />
   </UserControl.Resources>
   <StackPanel DataContext="{Binding Source={StaticResource vmMenuViewModel}}">
       <HyperlinkButton Content="صفحه یک" Margin="5"
                        Command="{Binding DoNavigate}"
                        CommandParameter="/Views/Page1.xaml"
                        />
       <HyperlinkButton Content="صفحه دو" Margin="5"
                        Command="{Binding DoNavigate}"
                        CommandParameter="/Views/Page2.xaml"
                        />
   </StackPanel>
</UserControl>

using GalaSoft.MvvmLight.Command;
using GalaSoft.MvvmLight.Messaging;

namespace MvvmLight6.ViewModels
{
public class MenuViewModel
{
    public RelayCommand<string> DoNavigate { set; get; }

    public MenuViewModel()
    {
        DoNavigate = new RelayCommand<string>(doNavigate);
    }

    private static void doNavigate(string url)
    {
        Messenger.Default.Send(url, "MyNavigationService");
    }
}
}

<UserControl x:Class="MvvmLight6.MainPage"
   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
   xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
   xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
   xmlns:sdk="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
   xmlns:usr="clr-namespace:MvvmLight6.Views"
   mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="400">
   <Grid x:Name="LayoutRoot" Background="White">
       <Grid.ColumnDefinitions>
           <ColumnDefinition Width="*" />
           <ColumnDefinition Width="268" />
       </Grid.ColumnDefinitions>
       <usr:Menu Grid.Column="1" />
       <sdk:Frame Margin="5"
                  Name="frame1"
                  HorizontalContentAlignment="Stretch"
                  VerticalContentAlignment="Stretch"
                  Grid.Column="0" />
   </Grid>
</UserControl>

using System;
using GalaSoft.MvvmLight.Messaging;

namespace MvvmLight6
{
public partial class MainPage
{
    public MainPage()
    {
        registerMessenger();
        InitializeComponent();
    }

    private void registerMessenger()
    {
        Messenger.Default.Register<string>(this, "MyNavigationService", doNavigate);
    }

    private void doNavigate(string uri)
    {
        frame1.Navigate(new Uri(uri, UriKind.Relative));
    }
}
}

• DataContext: این شیء اتصالش را به منبع داده‌ها برقرار کرده و هر موقع داده‌ای را نیاز داریم، از طریق این شیء تامین می‌شود.
• DataBinding: یک واسطه بین DataContext و هر آن چیزی است که قرار است از داده‌ها تغذیه کند. در تعریفی رسمی‌تر می‌گوییم: روشی ساده و قدرتمند بوده و واسطی است بین مدل تجاری و رابط کاربری. هر زمانی که داده‌ای تغییر کند، ما را آگاه می‌سازد که می‌تواند یک ارتباط یک طرفه یا دو طرفه باشد.
  
• DataTemplate: نحوه‌ی فرمت بندی و نمایش داده‌ها را تعیین می‌کند.

   public enum FieldOfWork
    {
        Actor=0,
        Director=1,
        Producer=2
    }
    public class Person
    {
        public string Name { get; set; }

        public bool Gender { get; set; }

        public string ImageName { get; set; }

        public string Country { get; set; }

        public DateTime Date { get; set; }

        public IList<FieldOfWork> FieldOfWork { get; set; }
        public static Person GetPerson()
        {
            return new Person()
            {
                Name = "Leo",
                Gender = true,
                ImageName ="man.jpg",
                Country = "Italy",
                Date = DateTime.Now
            };
        }
    }

 DataContext = Person.GetPerson();

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DataContext = Person.GetPerson();
        }  
    }

Text="{Binding Name}"

Source="{Binding ImageName}"

namespace WpfViewModelLocator.ViewModels
{
    public class MainWindowViewModel
    {
        public string SomeText { set; get; }
        public MainWindowViewModel()
        {
            SomeText = "Data ...";
        }
    }
}

using WpfViewModelLocator.ViewModels;

namespace WpfViewModelLocator.ViewModelLocator
{
    public class ViewModelLocatorBase
    {
        public MainWindowViewModel MainWindowVm
        {
            get { return new MainWindowViewModel(); }
        }
    }
}

<Application x:Class="WpfViewModelLocator.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vml="clr-namespace:WpfViewModelLocator.ViewModelLocator"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <vml:ViewModelLocatorBase x:Key="ViewModelLocatorBase" />
    </Application.Resources>
</Application>

<Window x:Class="WpfViewModelLocator.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        
        Title="MainWindow" Height="350" Width="525">
    <Grid DataContext="{Binding Path=MainWindowVm, Source={StaticResource ViewModelLocatorBase}}">
        <TextBlock Text="{Binding SomeText}" VerticalAlignment="Top" Margin="5" />
    </Grid>
</Window>

using System;
using System.Globalization;
using System.Linq;
using System.Windows.Data;

namespace WpfViewModelLocator.ViewModelLocator
{
    public class ViewModelLocatorBaseConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            //مقدار در اینجا همان مشخصات ویوو است
            if (value == null) return null;
            string viewTypeName = value.GetType().Name;

            //قرار داد ما است
            //ViewModel Name = ViewName + "ViewModel"
            string viewModelName = string.Concat(viewTypeName, "ViewModel");

            //یافتن اسمبلی که حاوی ویوو مدل ما است
            var asms = AppDomain.CurrentDomain.GetAssemblies();
            var viewModelAsmName = "WpfViewModelLocator"; //نام پروژه مرتبط
            var viewModelAsm = asms.Where(x => x.FullName.Contains(viewModelAsmName)).First();

            //یافتن این کلاس ویوو مدل مرتبط
            var viewModelType = viewModelAsm.GetTypes().Where(x => x.FullName.Contains(viewModelName)).FirstOrDefault();
            if (viewModelType == null)
                throw new InvalidOperationException(string.Format("Could not find view model '{0}'", viewModelName));

            //وهله سازی خودکار آن
            return Activator.CreateInstance(viewModelType);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

<Application x:Class="WpfViewModelLocator.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vml="clr-namespace:WpfViewModelLocator.ViewModelLocator"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <vml:ViewModelLocatorBaseConverter x:Key="ViewModelLocatorBaseConverter" />
    </Application.Resources>
</Application>

<Window x:Class="WpfViewModelLocator.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"                
        DataContext="{Binding RelativeSource={RelativeSource Self}, 
                              Converter={StaticResource ViewModelLocatorBaseConverter}}"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TextBlock Text="{Binding SomeText}" VerticalAlignment="Top" Margin="5" />
    </Grid>
</Window>

  xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"  
  xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"

<Window x:Class="WpfCallMethodActionSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        
        xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
        xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
        xmlns:vm="clr-namespace:WpfCallMethodActionSample.ViewModels" 
        Name="ThisWindow"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <vm:MainWindowViewModel x:Key="vmMainWindowViewModel" />
    </Window.Resources>
    <Grid DataContext="{Binding Source={StaticResource vmMainWindowViewModel}}">

        <Button Content="Save &amp; Close" VerticalAlignment="Top" Margin="5">            
            <i:Interaction.Triggers>
                <!--فراخوانی متدی در ویوو مدل-->
                <i:EventTrigger EventName="Click">
                    <ei:CallMethodAction 
                            TargetObject="{Binding}"
                            MethodName="SaveButtonClicked" />
                </i:EventTrigger>

                <!--فراخوانی متدی در شیء جاری از طریق ویوو مدل-->
                <i:EventTrigger SourceObject="{Binding}"  EventName="CloseMainWindow">
                    <ei:CallMethodAction
                            TargetObject="{Binding ElementName=ThisWindow}"
                            MethodName="Close"/>
                </i:EventTrigger>
            </i:Interaction.Triggers>            
        </Button>
    </Grid>
</Window>

using System;

namespace WpfCallMethodActionSample.ViewModels
{
    public class MainWindowViewModel
    {
        public void SaveButtonClicked()
        {
            close();
        }

        public event EventHandler CloseMainWindow;
        private void close()
        {
            if (CloseMainWindow != null) CloseMainWindow(this, EventArgs.Empty);
        }
    }
}

TargetObject="{Binding ElementName=ThisWindow}"

<i:EventTrigger SourceObject="{Binding}"  EventName="CloseMainWindow">