CHG (#2714): define region of visibility of the menu widget. In 2D Render Windows the region is defined in the upper region of each window. In 3D in the upper right corner. The show/hide Event moved from enter-/leaveEvent to MouseEvent. 
CHG (#2714): define region of visibility of the menu widget. In 2D Render Windows the region is defined in the upper region of each window. In 3D in the upper right corner. The show/hide Event moved from enter-/leaveEvent to MouseEvent. 


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