Inserts a new item into the pop-up menu at the specified location.
int InsertItem(
   const CMFCToolBarMenuButton& button,
   int iInsertA = -1
);
Parameters
- [in] button 
 A reference to the menu item to add.
- [in] iInsertAt 
 The zero-based index for the new item. If iInsertAt is -1, the item is added to the end of the menu.
Return Value
The zero-based index of the position where the item was inserted. -1 if the method fails.
Remarks
This method will fail if you provide an invalid value for iInsertAt, such as an integer larger than the number of items currently on the pop-up menu.
Requirements
Header: afxpopupmenu.h