Once Windows has determined the height and width of a given menu item, it sends WM_DRAWITEM message. Its first parameter again is the control identifier (0 for menus) and the second one points to DRAWITEMSTRUCT type.

Public Type DRAWITEMSTRUCT

CtlType As Long
CtlID As Long
itemID As Long
itemAction As Long
itemState As Long
hwndItem As Long
hdc As Long
rcItem As RECT
itemData As Long

End Type

What we need to do now, is draw the menu item into the DC specified by hdc member of DRAWITEMSTRUCT and in the location pointed by rcItem (you cannot draw outside this rectangle, if you do - it will be clipped). itemState member contains the current state of the item (checked, highlighted and so on - we only care whether ODS_HIGHLIGHTED bit is raised). So we check what itemData is (the number of the menu item) and then accordingly to itemState, copy an image from a picturebox into hdc using BitBlt.

Having processed the message, return True (MyWndProc = 1).

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Copyright (c) 1999, Billy&George Software and Peter Dimitrov
Revised May 1999