WM_CTLCOLORSCROLLBAR

The WM_CTLCOLORSCROLLBAR message is sent to the parent window of a scroll bar control when the control is about to be drawn. By responding to this message, the parent window can use the given display context handle to set the background color of the scroll bar control.

WM_CTLCOLORSCROLLBAR 
hdcSB  = (HDC) wParam;   // handle to scroll-bar display context 
hwndSB = (HWND) lParam;  // handle to scroll bar

Parameters

hdcSB: Value of wParam. Handle to the device context for the scroll bar control.
hwndSB: Value of lParam. Handle to the scroll bar.

Return Values

If an application processes this message, it must return the handle to a brush. The system uses the brush to paint the background of the scroll bar control.

Default Action

The DefWindowProc function selects the default system colors for the scroll bar control.

Remarks

The system does not automatically destroy the returned brush. It is the application's responsibility to destroy the brush when it is no longer needed.

The WM_CTLCOLORSCROLLBAR message is never sent between threads; it is only sent within the same thread.

If a dialog box procedure handles this message, it should cast the desired return value to a BOOL and return the value directly. If the dialog box procedure returns FALSE, then default message handling is performed. The DWL_MSGRESULT value set by the SetWindowLong function is ignored.

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