maximize list control within playlist dialog

void CPlaylistDlg::OnHideControls() 
{
        m_HideControls ^= 1;
        CWnd    *wp = GetWindow(GW_CHILD);
        while (wp != NULL) {
                if (wp != &m_List)
                        wp->ShowWindow(m_HideControls ? SW_HIDE : SW_SHOW);
                wp = wp->GetNextWindow();
        }
        PostMessage(WM_SIZE);
}

void CPlaylistDlg::OnSize(UINT nType, int cx, int cy) 
{
        CToolDlg::OnSize(nType, cx, cy);
        if (m_HideControls) {
                CRect   r;
                GetClientRect(r);
                m_List.MoveWindow(r);
        } else
                m_Resize.OnSize();
}

void CPlaylistDlg::OnShowWindow(BOOL bShow, UINT nStatus) 
{
        CToolDlg::OnShowWindow(bShow, nStatus);
        if (bShow && !m_HideControls)
                m_Resize.OnSize();
}