Modifies the provided menu when the application displays a shortcut menu on the parent toolbar.
virtual BOOL OnCustomizeMenu(
   CMenu* pMenu
);
Parameters
- [in] pMenu
 The menu to customize.
Return Value
This method returns TRUE.
Remarks
This method extends the base class implementation (CMFCToolBarButton::OnCustomizeMenu) by disabling the following menu items:
- Copy Button Image 
- Button Appearance 
- Image 
- Text 
- Image and Text 
Override this method to modify the shortcut menu that the framework displays in customization mode.
Requirements
Header: afxdropdowntoolbar.h