private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
this.Closing -= this.Window_Closing;
e.Cancel = true;
DoubleAnimation animation = ElementRenderer.WindowAnimation(this);
this.BeginAnimation(Window.OpacityProperty, animation);
animation.Completed += (s, _) => this.Close();
this.BeginAnimation(UIElement.OpacityProperty, animation);
}
private void Window_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
{
DoubleAnimation animation = ElementRenderer.WindowAnimation(this, 0, 1);
this.BeginAnimation(Window.OpacityProperty, animation);
}