void CMainFrame::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI)

{

 // TODO: Add your message handler code here and/or call default

 lpMMI->ptMinTrackSize.x   = 100 ;

   lpMMI->ptMinTrackSize.y   = 100  ;

   lpMMI->ptMaxTrackSize.x   = 200  ;

    lpMMI->ptMaxTrackSize.y   =  200;   

 CFrameWnd::OnGetMinMaxInfo(lpMMI);

}