The WM_DRAWITEM message is sent to the owner window of an owner-drawn button, combo box, list box, or menu when a visual aspect of the button, combo box, list box, or menu has changed.
WM_DRAWITEM idCtl = (UINT) wParam; // control identifier lpdis = (LPDRAWITEMSTRUCT) lParam; // item-drawing information
If an application processes this message, it should return TRUE.
The DefWindowProc function draws the focus rectangle for an owner-drawn list box item.
The itemAction member of the DRAWITEMSTRUCT structure specifies the drawing operation that an application should perform.
Before returning from processing this message, an application should ensure that the device context identified by the hDC member of the DRAWITEMSTRUCT structure is in the default state.
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