A class to assist in creating popup windows like combo box drop-downs and menus. This class includes functionality to keep the title bar of the popup owner form active while the popup is displayed, and to automatically cancel the popup whenever the user clicks outside the popup window or shifts focus to another application.

public class PopupWindowHelper : System.Windows.Forms.NativeWindow 

'Declaration
 
Public Class PopupWindowHelper 
   Inherits System.Windows.Forms.NativeWindow

'Usage
 
Dim instance As PopupWindowHelper