void ChangeImage()
{
	if(MainForm->imgReady->Visible==true)
	{
		MainForm->imgReady->Visible=false;
		MainForm->imgTest->Visible=true;
		MainForm->imgReady->Update();
		MainForm->imgTest->Update();
	}
	else if(MainForm->imgReady->Visible==false)
	{
		MainForm->imgTest->Visible=false;
		MainForm->imgReady->Visible=true;
		MainForm->imgReady->Update();
		MainForm->imgTest->Update();
	}
}


void __fastcall TMainForm::btStartClick(TObject *Sender)
{
	try
	{
		ChangeImage();
		MyFunc();
	} __finally
	{		
		ChangeImage();
	}
}