帮帮我呀，使用滚动条设置颜色

老是说我没有定义labelR,labelB,labelG,怎么回事呀？

高手帮帮忙，谢谢

//—————————————————————————

#include <vcl.h>
#pragma hdrstop

#include “Unit1.h”
//—————————————————————————
#pragma package(smart_init)
#pragma resource “*.dfm”
TForm1 *Form1;
//—————————————————————————
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//—————————————————————————

void __fastcall TForm1::ScrollBarRChange(TObject *Sender)
{
  LabelR->Caption=IntToStr(ScrollBarR->Position);
   Shape1->Brush->Color=RGB(ScrollBarR->Position,
         ScrollBarG->Position,ScrollBarB->Position);

}
//—————————————————————————

void __fastcall TForm1::ScrollBarBChange(TObject *Sender)
{
   LabelB->Caption=IntToStr(ScrollBarB->Position)  ;
   Shape1->Brush->Color=RGB(ScrollBarR->Position,
         ScrollBarG->Position,ScrollBarB->Position);

}
//—————————————————————————
void __fastcall TForm1::ScrollBarGhange(TObject *Sender)
{
 LabelG->Caption=IntToStr(ScrollBarY->Position)  ;
 Shape1->Brush->Color=RGB(ScrollBarR->Position,
         ScrollBarG->Position,ScrollBarB->Position);

}
//—————————————————————————
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    Timer->Enable=true;
}
//—————————————————————————
void __fastcall TForm1::Button2Click(TObject *Sender)
{
  Timer->Enable=false;
}
//—————————————————————————
void __fastcall TForm1::Button3Click(TObject *Sender)
{
    Form1=close();
}
//—————————————————————————
void __fastcall TForm1::Timer1Timer(TObject *Sender)
{
    randomsize();
    ScrollBarR->Position=rand()%256;
    ScrollBarY->Position=rand()%256;
    ScrollBarB->Position=rand()%256;
     Shape1->Brush->Color=RGB(ScrollBarR->Position,
         ScrollBarY->Position,ScrollBarB->Position);
}