void CButtonDlg::PushStage()
{
m_ButtonSample1.SetState(TRUE);//m_ButtonSample1 is the member variable of CButton
m_ButtonSample2.SetState(TRUE);//m_ButtonSample2 is the member variable of CButton
}

now call PushStage() function in all the button clicks... like below

void CButtonDlg::OnButtonSample1() // Event of Button 1
{
	// TODO: Add your control notification handler code here
	PushStage();
	
}

void CButtonDlg::OnButtonSample2() // Event of Button 2
{
	// TODO: Add your control notification handler code here
	PushStage();
	
}