private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// in lieu of DependencyObject.SetCurrentValue, this is the easiest way to enact a change on the value of the Popup's IsOpen
// property without overwriting any binding that may exist on it
var storyboard = new Storyboard() { Duration = TimeSpan.Zero };
var objectAnimation = new ObjectAnimationUsingKeyFrames() { Duration = TimeSpan.Zero };
objectAnimation.KeyFrames.Add(new DiscreteObjectKeyFrame() { KeyTime = KeyTime.FromTimeSpan(TimeSpan.Zero), Value = false });
Storyboard.SetTarget(objectAnimation, this.popup);
Storyboard.SetTargetProperty(objectAnimation, new PropertyPath("IsOpen"));
storyboard.Children.Add(objectAnimation);
storyboard.Begin();
}
}
