Called by the framework when the Taskbar tab thumbnail should process the WM_ACTIVATE message.
Specifies whether the CWnd is being activated or deactivated.
Pointer to the CWnd being activated or deactivated. The pointer can be NULL, and it may be temporary.
Specifies the minimized state of the CWnd being activated or deactivated. A value of TRUE indicates the window is minimized.
The default implementation activates the related MDI child frame.