Как избавится от рамки цвета формы при движении картинки?

//---------------------------------------------------------------------------
 
#include <vcl.h>
#pragma hdrstop
#include "PngImage.hpp"
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
  TPngImage *play1 = new TPngImage;
  TPngImage *play2 = new TPngImage;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
 
play1->LoadFromFile("play.png");
play2->LoadFromFile("play2.png");
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Image1MouseEnter(TObject *Sender)
{
Image1->Top=Image1->Top-6;
Image1->Left=Image1->Left-6;
 Image1->Picture->Assign(play1);
 Image1->Height=64;
 Image1->Width=64;
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Image1MouseLeave(TObject *Sender)
{
Image1->Top=Image1->Top+6;
Image1->Left=Image1->Left+6;
 Image1->Picture->Assign(play2);
 Image1->Height=58;
 Image1->Width=58;
}

Form1->DoubleBuffered = true;