private void btnCreateValue(object sender, RoutedEventArgs e) { string content = (sender as Button).Tag.ToString(); var dialog = new CreateValue(); if (dialog.ShowDialog() == true) { if (!string.IsNullOrWhiteSpace(dialog.ResponseText)) { Property prop = PropRep.GetByName(content); DataFac.AddValueToProp(dialog.ResponseText, prop._id); KeepSelectedValues(); } else { MessageBox.Show("Du mangler at udfylde feltet"); } } }