class MyGridDisplay : public GridDisplay {
public:	
		
    virtual void Paint(Draw &w, int x, int y, int cx, int cy, const Value &val, dword style,
		       Color &fg, Color &bg, Font &fnt, bool found, int fs, int fe)
    {
        if (bg == SColorHighlight) {
            bg = Color(255, 0, 0); // <- Change background color to red.
        }
        GridDisplay::Paint(w, x, y, cx, cy, val, style, fg, bg, fnt, found, fs, fe);

        return;
    }    
		
};

GridCtrl grid;
grid.SetDisplay(Single <MyGridDisplay> ());