private void ShowSubscribeForm()
 {
     if (subscribeConfigForm != null)
     {
         subscribeConfigForm.Activate();
     }
     else
     {
         subscribeConfigForm = new SubscribeConfigForm(controller);
         subscribeConfigForm.Show();
         subscribeConfigForm.Activate();
         subscribeConfigForm.FormClosed += subscribeConfigForm_FormClosed;
     }
 }
 private void subscribeConfigForm_FormClosed(object sender, FormClosedEventArgs e)
 {
     subscribeConfigForm.Dispose();
     subscribeConfigForm = null;
     //rebuild menu
     ServersItem.MenuItems.Clear();
     ServersItem.MenuItems.AddRange(new[]
     {
         SeperatorItem,
         ConfigItem,
         new MenuItem("-"),
         ShareQR,
         ScanQR,
         ImportFromClipboard
     });
     UpdateServersMenu();
     //done
     Utils.ReleaseMemory(true);
 }