delphi - How to change background color of margins in RichEdit? -

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i used following code add margins richedit. how can change background color?

procedure tform1.button1click(sender: tobject); var    lrect: trect; begin    lrect := richedit1.clientrect;    inflaterect(lrect, -25, -25);     richedit1.perform(em_setrect, 0, integer(@lrect)); end;

em_setrect merely tells richedit rectangle allowed render text. change background color of margin reserving space for, have subclass richedit handle wm_paint messages directly, can draw whatever want in space.


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