BCGControlBar Pro for MFC
virtual void CBCGPAppBarWnd::OnAppBarPosChanged ( )
virtual

Called by the framework to handle the system ABN_POSCHANGED notification.

The ABN_POSCHANGED message notifies the application bar when an event has occurred that may affect the application bar's size and position. These events include changes in the task bar's size, position, and visibility as well as adding, removing, or resizing another application bar on the same side of the screen.