Leave list box on the screen after exit from the subroutine. In GUI mode, this also leaves the control defined, for possible re-entry or refresh later. See XTF_NOSEL and xtrctl XTR.OPCODE. The symbol name, XTF_MODELESS, is meant to represent "modeless", since this makes the pick list act something like a modeless dialog, i.e. a dialog that allows you to click back on the main window without first closing it, as opposed to the normal "modal" dialog. Also see XTF_DISABLE.
