<oTopBar>:display() --> self

        display() is a method of the TopBarMenu class that is used for
        showing a top bar menu and its items on the screen.  It also shows
        the status bar description for menu items that contain one.
        display() uses the values of the following instance variables to
        correctly show the list in its current context, in addition to
        providing maximum flexibility in the manner a top bar menu appears on
        the screen: colorSpec, current, itemCount, left, right, and row.

        Note:  See the MENUMODAL() function in this guide for more
        information about displaying and activating a top menu bar.