Notifies an appbar that the user has selected the Cascade, Tile Horizontally, or Tile Vertically command from the taskbar's shortcut menu.
A flag specifying whether the cascade or tile operation is beginning. This parameter is TRUE if the operation is beginning and the windows have not yet been moved. It is FALSE if the operation has completed.
No return value.
The system sends this notification message twice—first with lParam set to TRUE and then with lParam set to FALSE. The first notification is sent before the windows are cascaded or tiled, and the second is sent after the cascade or tile operation has occurred.
Minimum supported client
|Windows XP [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|