Changing the visibility/animations of UI elements

<Image Name="testImage" Canvas.Top="-16" Canvas.Left="246" HorizontalAlignment="Left" VerticalAlignment="Top" Height="64" Width="64" Source="/button_onbeat.png"></Image>

testImage.Visibility= Visibility.Collapsed;
// and
Application.Current.Dispatcher.Invoke(() =>
{
    testImage.Visibility = Visibility.Collapsed;
});