private void EditClientCommandExecute(object clientId)
        {
            if (ClientItemSelected == null && clientId == null)
            {
                RadWindow.Alert("Выберите пользователя которого требуется заблокировать.");
                return;
            }

            if (ClientItemSelected == null || clientId != null && ClientItemSelected.ClientId != (Guid)clientId)
                ClientItemSelected = ClientCollection.Where(x => x.ClientId == (Guid)clientId).FirstOrDefault();

            var dialog = new Views.ClientInfoView(ClientItemSelected);
            dialog.Closed += (dialogSender, dialogArgs) => UpdateClients();
            dialog.Show();
        }
        private void AddClientCommandExecute()
        {
            var dialog = new Views.ClientInfoView();
            dialog.Closed += (dialogObject, dialogArgs) =>
                                 {
                                     _realClientCollection.Add(((ClientInfoViewModel) dialog.DataContext).Client);
                                     UpdateClients();
                                 };

            dialog.Show();
        }