void Paint(Draw& w) {
    w.DrawRect(10, 10, 100, 100, Color(Red, 128));
}

void Paint(Draw& w) {

    SystemDraw& sw = (SystemDraw&) w;    
    col.r = Red().GetR();
    col.g = Red().GetG();
    col.b = Red().GetB();
    col.a = 128;
    sw.RectPath(10, 10, 100, 100).Fill(col);
}

void Paint(Draw& w) {

    SystemDraw& sw = (SystemDraw&) w;
    sw.alpha = 128;   
    sw.DrawRect(10, 10, 100, 100, Red);
}