SetForegroundWindow();

void CSetFWinDlg::OnButton1() 
{
SetTimer(1,3000,0);	
}

void CSetFWinDlg::OnTimer(UINT nIDEvent) 
{
	// TODO: Add your message handler code here and/or call default
	SetForegroundWindow();
	CDialog::OnTimer(nIDEvent);
}