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#define INCL_WINFRAMEMGR
 
WM_NEXTMENU
hwnd = HWNDFROMMP(mp1);              /* window handle */
fPrev = (BOOL) SHORT1FROMMP(mp2);    /* previous flag */
 
The WM_NEXTMENU message is sent to the owner of a menu window to obtain the
next or previous menu window. For example, this message is sent when either
the beginning or the end of a menu has been reached when enumerating menus
with the direction keys.
 
The WM_NEXTMENU message is processed by frame windows by toggling between
the frame's main action-bar menu and the system menu. To implement a
multiple-document interface, change this frame-window action to include the
active child window's system menu in the menu enumeration set.
 
Parameter  Description
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hwnd       Low and high word of mp1. Identifies the current menu.
 
fPrev      Low word of mp2. Specifies whether to go to the next or previous
           menu. When this parameter is TRUE, go to the previous menu. When
           it is FALSE, go to the next menu.
 
Return Value
 
An application should return a handle to the next or previous menu. It
should return NULL if a valid handle cannot be obtained.
 
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