‫XAML Behaviors سورس باز شد

<Button>
    <Interactivity:Interaction.Behaviors>
        <Core:EventTriggerBehavior EventName="Click">
            <Core:ChangePropertyAction PropertyName="Background">
                <Core:ChangePropertyAction.Value>
                    <SolidColorBrush Color="Red"/>
                </Core:ChangePropertyAction.Value>
            </Core:ChangePropertyAction>
        </Core:EventTriggerBehavior>
    </Interactivity:Interaction.Behaviors>
</Button>