Assembly: System.Windows.Forms (in system.windows.forms.dll)
The Popup event is raised whenever a ToolTip is displayed, either through am explicit call to one of the Show methods or when the ToolTip class implicitly displays a ToolTip. This event can be canceled.
Calling properties in this event that cause the underlying window handle to be recreated, such as IsBalloon, will result in an exception being thrown.
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.