WM_DRAWITEM (in Menu Controls) - Parameters

idMenu (USHORT)

Window identifier.

The window identity of the menu control sending this notification message.

pOwnerItem (POWNERITEM)

Owner-item structure.

This points to an owner-item structure; see OWNERITEM.

rc (BOOL)

Item-drawn indicator.

TRUE

The owner draws the item, and so the menu control does not draw it.
FALSE
If the item contains text and the owner does not draw the item, the owner returns this value and the menu control draws the item.

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