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     <oPopUp>:display() --> self

        display() is a method of the PopUpMenu class that is used for showing
        a pop-up menu including its items on the screen.  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 pop-up menu appears on the screen:

        .  MenuItem:checked
        .  MenuItem:enabled
        .  MenuItem:isPopUp
        .  PopUpMenu:bottom
        .  PopUpMenu:colorSpec
        .  PopUpMenu:current
        .  PopUpMenu:itemCount
        .  PopUpMenu:left
        .  PopUpMenu:right
        .  PopUpMenu:top
        .  PopUpMenu:width