How to do this?

I wrote a class CMyWnd which is derived from CWnd,and i created a docking pane to attach CMyWnd(shown as follows),but failed.

LRESULT CMainFrame::OnDockingPaneNotify(WPARAM wParam, LPARAM lParam)
{
    if(wParam == XTP_DPN_SHOWWINDOW)
    {
        CXTPDockingPane* pPane = (CXTPDockingPane*)lParam;
        if(!pPane->IsValid())
        {
             if(!m_myWnd.GetSafeHwnd())
              {
                  m_myWnd.Create(NULL,NULL,
                        WS_CHILD | WS_VISIBLE,
                         CRect(0,0,0,0),this,0x106);
             }
             pPane->Attach(&m_myWnd);
        }
        return TRUE;
    }
    return FALSE;
}

Would you please tell me how to create a window manually and attach to a docking pane.

thanks.