This message is sent to the parent of a display control, prior to rendering of its text. It offers the parent the opportunity to change the text color and the background color.
The handle of the device context in which the drawing is to take place.
The handle of the display window.
If the parent window processes this message, it should return a handle of a brush that will be used to render the background of the display field.
The default window procedure selects system colors in which to draw the display.