This should get you started:
TExtDrawGrid = class(TDrawGrid)
protected
procedure WMEraseBkGnd(var Msg: TWMEraseBkGnd); message WM_ERASEBKGND;
public
end;
procedure TExtDrawGrid.WMEraseBkGnd(var Msg: TWMEraseBkGnd);
begin
Canvas.Draw(ClientRect.Left, ClientRect.Top, TheBackgroundBitMap);
end;
Setting the DefaultDrawing property to false will prevent the grid from overwriting the back ground with standard cell display. You can decide what gets drawn on top of the background for any given cell. Maybe override the paint method to clean up before the rest gets slapped on top.
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