usshowsubmenu (USHORT)

      Show submenu flag.

      TRUE

        Show the submenu (pull-down menu) of the selected action bar item when the menu enters selection mode. If the action bar is not visible, the submenu is shown, otherwise it is not shown. If the item selected does not have a submenu, this parameter is ignored.
      FALSE
        Do not show the submenu (pull-down menu) of the selected action bar item when the menu enters selection mode.

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