Method XbpMenuBar():setItem() Foundation
Replaces the specified menu item in the menu.
:setItem( <nItemIndex>, <aItem> ) --> lSuccess
This method returns the value .T. (true) if the menu item could be replaced, otherwise it returns .F. (false).
The :setItem() method replaces existing menu items in the menu object. This allows the menu appearance to be dynamically changed at runtime. This capability should rarely be needed, since the user interface does not need to be changed very often. The <aItem> parameter is the same as for the method :addItem() (see the :additem() method for more information).
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