Called by the framework when it displays a QuickCustomizePane.

virtual BOOL OnShowCustomizePane(
   CMFCPopupMenu* pMenuPane,
   UINT uiToolbarID 

[in] pMenuPane

A pointer to the quick customize pane.

[in] uiToolbarID

The control ID of the toolbar to customize.

This method always return TRUE.

The quick customize menu is a pop-up menu that appears when you click the toolbar’s customize button

Header: afxframewndex.h