private void OnNewAddAdress(MedicalPractice obj)
        {
            if (Model == null)
            {
                return;
            }

            IsEditingAddress                 = false;
            SelectedAddress                  = new MedicalPracticeAddress();
            SelectedAddress.State            = AvailableStates.Select(state => state).FirstOrDefault();
            SelectedAddress.PropertyChanged += (o, e) => SelectedAddress.Validate();
            ShowAddressPopup                 = Visibility.Visible;
        }