private void AboutButton_Click (object sender, RibbonControlEventArgs e)
 {
   using (var aboutForm = new AboutForm())
   {
     aboutForm.ShowDialog();
   }
 }
 private void ToolBarBtn_About_OnClick (CommandBarButton Ctrl, ref bool CancelDefault)
 {
   using (var aboutForm = new AboutForm())
   {
     aboutForm.ShowDialog();
   }
 }