public async void ExecuteAddAclCommand(object parameter)
        {
            Busy        = true;
            BusyContent = "Adding ACL";

            try
            {
                var identity = new IdentityDescriptionObject(SelectedIdentity.Mrn, SelectedIdentity.Name);

                await Task.Factory.StartNew(() =>
                {
                    var visService = new VisService();
                    visService.AuthorizeIdentities(Id, new List <IdentityDescriptionObject>
                    {
                        identity
                    });
                });

                AclList.Add(identity);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
            finally
            {
                Busy = false;
            }
        }