sub-menu goes above the menu

hello,.
in some of my forms, the Menu is positions in the right-most of the screen.
when i click a MenuItem, it looks like the property "OpenOnRight" works differently, and the sub menus are going on top of the menu, instead of to the left.
the menu orientation is vertical.
Thanks
in some of my forms, the Menu is positions in the right-most of the screen.
when i click a MenuItem, it looks like the property "OpenOnRight" works differently, and the sub menus are going on top of the menu, instead of to the left.
the menu orientation is vertical.
Thanks