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     <oTopBar>:getFirst() --> nPosition

        Returns a numeric value that indicates the position within the top
        bar menu of the first selectable item.  getFirst() returns 0 in the
        event that the top bar menu does not contain a selectable item.

        getFirst() is a method of the TopBarMenu class that is used for
        determining the position of the first selectable item in a top bar
        menu.  The term selectable is defined as a menu item that is enabled
        and whose caption is not a menu separator.

        Note:  getFirst() does not change the currently selected menu
        item.  In order to change the currently selected top bar menu item,
        you must call the TopBarMenu:select() method.