Called by the framework when it displays a QuickCustomizePane.
virtual BOOL OnShowCustomizePane(
   CMFCPopupMenu* pMenuPane,
   UINT uiToolbarID 
);
Parameters
- [in] pMenuPane 
 A pointer to the quick customize pane.
- [in] uiToolbarID 
 The control ID of the toolbar to customize.
Return Value
This method always return TRUE.
Remarks
The quick customize menu is a pop-up menu that appears when you click the toolbar’s customize button
Requirements
Header: afxframewndex.h