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我得speedbutton1是放在panel上的，
BnOKDefProc = SpeedButton1->WindowProc;
        SpeedButton1->WindowProc = BnOkWndProc;
void __fastcall TForm1::BnOkWndProc(Messages::TMessage &Message)
{
        if(Message.Msg==WM_PAINT){
                 int i;
                TPoint c;
                TControlCanvas * test = new TControlCanvas;
                test->Control = Panel1;
                for (i=0;i<=Panel1->Width;i++)
                {
                        test->Pen->Width =Panel1->Width+100;
                        test->Pen->Color =TColor(RGB(i,250,500));

                        test->MoveTo(i,0);
                        test->LineTo(i,Panel1->Height );
                }
                 SpeedButton1->Flat=true;
        }
  BnOKDefProc(Message);
}
这样的，我每次去点击speedbutton，都会产生重画，画面都抖动的厉害，可如果设为BnOKDefProc =panel1->WindowProc;这样的话我得speedbutton一开始就不会显示，必须等到我去点击，才会显示，而且speedbutton显示的背景并不是渐变后的颜色

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