private void ShowCorrespondenceCommandExecuted(CorrespondenceModel obj)
        {
            RaisePropertyChanged("DisableParentWindow");

            var window = new SendEventMailView(_event, obj);
            window.ShowDialog();

            RaisePropertyChanged("EnableParentWindow");
        }
        private void SendEmailCommandExecuted()
        {
            RaisePropertyChanged("DisableParentWindow");

            var window = new SendEventMailView(_event);
            window.ShowDialog();

            RaisePropertyChanged("EnableParentWindow");
        }