Menu Operations When MDI Child Maximized

• Microsoft Windows Software Development Kit (SDK) versions 3.0 and 3.1
• Microsoft Win32 Application Programming Interface (API) included with:

      - Microsoft Windows NT versions 3.5 and 3.51
      - Microsoft Windows 95 version 4.0
  

Pop-up menus added to an MDI application's menu using InsertMenu() with MF_BYPOSITION will be inserted one position further left than expected if the active MDI child window is maximized. This behavior occurs because the system menu of the active MDI child is inserted into the first position of the MDI frame window's menu bar.

To avoid this problem, if the active child is maximized when a new pop-up is inserted by position, add 1 (one) to the position value that would otherwise have been used. To determine that the currently active child window is maximized, send a WM_MDIGETACTIVE message to the MDI client window. In 16-bit Windows, if the high word of the return value from this message contains 1, the active child window is maximized. In Win32, you need to pass a pointer to a BOOL in the lParam. If the child window is maximized, then Windows will set the BOOL pointed to by the lParam to TRUE.