dopup - displays the specified pop-up menu
pup expects the identifier of the pop-up menu you want to display.
FUNCTION RETURN VALUE
The returned value of the function is the value of the item selected from
the pop-up menu. If the user makes no menu selection, the returned value
of the function is -1.
dopup displays the specified pop-up menu until the user makes a
selection. If the calling program has the input focus, the menu is
displayed and dopup returns the value resulting from the item selection.
The value can be returned by a submenu, a function, or a number bound
directly to an item. Item selections are made with the right mouse
button. If no selection is made, dopup returns -1.
When you first define the menu (using defpup or addtopup) you specify the
list of menu entries and their corresponding actions. See addtopup for
addtopup, defpup, freepup, newpup, setpup
This routine is available only in immediate mode.
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