Called by the framework when the nonclient area is being destroyed, and is the last member function called when the Windows window is destroyed.
afx_msg void OnNcDestroy( );
The default implementation performs some cleanup, then calls the virtual member function PostNcDestroy.
Override PostNcDestroy if you want to perform your own cleanup, such as a delete this operation. If you override OnNcDestroy, you must call OnNcDestroy in your base class to ensure that any memory internally allocated for the window is freed.