A method that will handle events that relate to popup window manipulations.
public delegate void PopupWindowEventHandler( object source, PopupWindowEventArgs e );
Public Delegate Sub PopupWindowEventHandler( source As Object, e As PopupWindowEventArgs )
A PopupWindowEventArgs object that contains event data.
When creating a PopupWindowEventHandler delegate, you identify a method that will handle the corresponding event. To associate an event with your event handler, add a delegate instance to the event. The event handler is called whenever the event occurs unless you remove the delegate. For more information about event handler delegates, see Events and Delegates in MSDN.