protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);

            m_wpfHelper.Detach();
            m_wpfHelper.Dispose();
            m_windowhost = null;
        }
 public static void ShowWindow()
 {
     if (m_windowhost != null)
     {
         m_windowhost.Focus();
         return;
     }
     m_windowhost = new CreateAndImportSchemaView();
     m_windowhost.Show();
 }