How to SetFocus to a CButton so that the border and focus dotted line are visible?

void CbuttonfocusDlg::OnBnClickedButton3()
{
    // TODO: Add your control notification handler code here
    GetDlgItem(IDC_BUTTON1)->SetFocus();

    Invalidate();

}

static_cast<CButton*>(GetDlgItem(IDC_BUTTON1))->SetButtonStyle(BS_DEFPUSHBUTTON);

this->m_myButton.SetButtonStyle(BS_DEFPUSHBUTTON);