public void OnNewGroup(object obj, EventArgs e)
 {
     Application.Current.Dispatcher.Invoke((Action) delegate {
         RMUserInGroup usrInGrp = (RMUserInGroup)obj;
         ss.Children.Add(new GroupItem(usrInGrp, clin, OnChangeSelectedGroup));
         OnCancelCreateGroup();
     });
 }
 public void RNewGroup(RMUserInGroup usrInGrp) => OnNewGroup?.Invoke(usrInGrp, null);