After the MDI program menu is drawn, how to deal with the minimize button? ? ? ?

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Multi-document program, when the child frame window is not opened, the frame is a separate window at this time. If maximized later. The maximize and minimize buttons of the child frame will go to the menu bar of the original frame. In this way, when self-drawing the sub-frame menu, I changed the background color of the menu bar, which blocked the maximize and minimize buttons. (Overwritten). But if you zoom in and out of the main window, you will find that these buttons go to the middle of the menu bar (it should be on the right). How do you handle these system buttons? ? ? Thank you