public override void Run(Altaxo.Graph.GUI.GraphController ctrl)
    {
      System.IO.Stream myStream ;
      SaveFileDialog saveFileDialog1 = new SaveFileDialog();
 
      saveFileDialog1.Filter = "Windows Metafiles (*.emf)|*.emf|All files (*.*)|*.*"  ;
      saveFileDialog1.FilterIndex = 1 ;
      saveFileDialog1.RestoreDirectory = true ;
 
      if(saveFileDialog1.ShowDialog() == DialogResult.OK)
      {
        if((myStream = saveFileDialog1.OpenFile()) != null)
        {
          ctrl.SaveAsMetafile(myStream);
          myStream.Close();
        } // end openfile ok
      } // end dlgresult ok
    }