public class DatabindingDebugConverter : IValueConverter
    {
        #region IValueConverter Members

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Debugger.Break();
            return value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Debugger.Break();
            return value;
        }

        #endregion IValueConverter Members
    }

<DataTemplate.Resources>
            <debug:DatabindingDebugConverter x:Key="databindingDebugConverter"/>
</DataTemplate.Resources>
<DataGrid ItemsSource="{Binding myViewModel,Converter={StaticResource databindingDebugConverter}}" />

 System.Windows.Data Error: 35 : BindingExpression path error: ‘X’ property not found ...

Binding"{Path=myViewModel.MyProperty.MyInnerPtoperty ,Converter="{StaticResource debugger}}"
Binding"{Path=myViewModel.MyProperty,Converter="{StaticResource debugger}}"
Binding"{Path=myViewModel,Converter="{StaticResource debugger}}"
Binding"{Path=.,Converter="{StaticResource debugger}}"