CMFCToolBar::IsAltCustomizeMode
Specifies whether quick customization is being used to drag a button. When quick customization is enabled, a user can press and hold the Alt key and drag a button to a new location.
static BOOL __stdcall IsAltCustomizeMode();
Return Value
TRUE if quick customization is being used to drag a button; otherwise, FALSE.
Requirements
Header: afxtoolbar.h