点击快了会闪烁,有解决方案吗?

.h文件
//---------------------------------------
#ifndef Unit1H
#define Unit1H
//---------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
//---------------------------------------
class TForm1 : public TForm
{
__published:// IDE-managed Components
        TButton *Button1;
        TButton *Button2;
private:// User declarations
        TWndMethod OldProc;
        void __fastcall NewProc(TMessage &Msg);
public:// User declarations
        __fastcall TForm1(TComponent* Owner);
};
//---------------------------------------
extern PACKAGE TForm1 *Form1;
//---------------------------------------
#endif

//---------------------------------------
.cpp文件
#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
    //SetWindowLong(Button1->Handle, GWL_STYLE, GetWindowLong(Button1->Handle,GWL_STYLE) | BS_OWNERDRAW );

    OldProc = Button1->WindowProc;
    Button1->WindowProc = NewProc;
    DoubleBuffered = true;
    
    //创建圆角矩形按钮，去掉这两句就是默认的矩形区域
    HRGN hRgnR = CreateRoundRectRgn(0,0,Button1->Width,Button1->Height,45,45);
    SetWindowRgn(Button1->Handle,hRgnR,TRUE);
}
//---------------------------------------
//用到三张图片，分别表示几种状态：正常（移出），移入（抬起），按下
void __fastcall TForm1::NewProc(TMessage &Msg)
{
    TRect Rect;
    Graphics::TBitmap* Bmp;
    TControlCanvas* Canvas; 
 

    OldProc(Msg);

    if(Msg.Msg == CM_MOUSEENTER)//鼠标移入
    {
        Bmp = new Graphics::TBitmap;
        Bmp->LoadFromFile("over2.bmp");
        Bmp->Transparent = true;
        Bmp->TransparentColor = clWhite;

        Canvas = new TControlCanvas;
        Canvas->Control = Button1;
        Canvas->Brush->Style= bsClear;

        Canvas->CopyRect(TRect(0,0,228,58), Bmp->Canvas,TRect(0,0,228,58));
        Canvas->Font->Color=clBlack;

        Canvas->TextOutA(23,10,"正常");
        delete Bmp;  delete Canvas;
    }
    if(Msg.Msg == CM_MOUSELEAVE)//鼠标移出
    {
        Bmp = new Graphics::TBitmap;
        Bmp->LoadFromFile("normal2.bmp");
        Bmp->Transparent = true;
        Bmp->TransparentColor = clWhite;//背景透明色
        
        Canvas = new TControlCanvas;
        Canvas->Control = Button1;
        Canvas->Brush->Style= bsClear; //文字透明

        Canvas->Draw(0, 0, Bmp);
        Canvas->Font->Color=clBlack;
        Canvas->Brush->Style= bsClear;
        Canvas->TextOutA(23,10,"正常");
        delete Bmp;  delete Canvas;
    }
    if(Msg.Msg == WM_LBUTTONDOWN) //鼠标按下
    {
        Bmp = new Graphics::TBitmap;
        Bmp->LoadFromFile("down2.bmp");
        Bmp->Transparent = true;
        Bmp->TransparentColor = clWhite; 
 
        
        Canvas = new TControlCanvas;
        Canvas->Control = Button1;
        Canvas->Control->Parent->DoubleBuffered =true;
      
        Canvas->CopyRect(TRect(0,0,228,58), Bmp->Canvas,TRect(0,0,228,58));
        Canvas->Font->Color=clBlack;

        Canvas->Brush->Style= bsClear;
        Canvas->TextOutA(23,10,"按下");
        delete Bmp;  delete Canvas;
        return;
    }
    if(Msg.Msg == WM_LBUTTONUP) //鼠标抬起
    {
        Bmp = new Graphics::TBitmap;
        Bmp->LoadFromFile("over2.bmp");
        
        Canvas = new TControlCanvas;
        Canvas->Control = Button1;

        Canvas->CopyRect(TRect(0,0,228,58), Bmp->Canvas,TRect(0,0,228,58));
        Canvas->Font->Color=clBlack;
        Canvas->Brush->Style= bsClear;
        Canvas->TextOutA(23,10,"抬起");
        delete Bmp;  delete Canvas;
        return;
    }

    if (Msg.Msg == WM_PAINT || Msg.Msg==BM_SETSTATE)//常规状态
    {
        Bmp = new Graphics::TBitmap;
        Bmp->Transparent = true;
        Bmp->TransparentColor = clWhite;
        
        Canvas = new TControlCanvas;
        Canvas->Control = Button1;
        Canvas->Control->Parent->DoubleBuffered =true;

        if(Msg.WParam == MK_LBUTTON)
        { 
 
          Bmp->LoadFromFile("down2.bmp");
        }
        else
          Bmp->LoadFromFile("normal2.bmp");
        
        Canvas->CopyRect(TRect(0,0,228,58), Bmp->Canvas,TRect(0,0,228,58));

        Canvas->Brush->Style= bsClear;
        if(Msg.WParam == MK_LBUTTON)
        {
          Canvas->Font->Color=clBlack;
          Canvas->TextOutA(23,10,"按下");
        }
        else
        {
          Canvas->Font->Color=clBlack;
          Canvas->TextOutA(23,10,"正常");
        }
        delete Bmp;  delete Canvas;
    }
}