<Window x:Class="SDKSample.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="AnimatedPopup"> <StackPanel> <CheckBox Name="myCheckBox" Margin="20,20,0,0" Content="Select CheckBox to see Popup"/> <Button HorizontalAlignment="Left" Width="200" Margin="20,10,0,0"> <Button.Triggers> <EventTrigger RoutedEvent="Button.Click"> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetName="theTransform" Storyboard.TargetProperty="(RotateTransform.Angle)" From="0" To="360" Duration="0:0:5" AutoReverse="True"/> </Storyboard> </BeginStoryboard> </EventTrigger> </Button.Triggers> Click to see the Popup animate </Button> </StackPanel> </Window>