Controls: Add UnitTextBox

Elwig/Windows/MemberAdminWindow.xaml.cs

@@ -668,7 +668,7 @@ namespace Elwig.Windows {
             InputLostFocus((TextBox)sender, Validator.CheckPredecessorMgNr);
         }
 
-        private new void PhoneNrInput_TextChanged(object sender, RoutedEventArgs evt) {
+        private new void PhoneNrInput_TextChanged(object sender, TextChangedEventArgs evt) {
             base.PhoneNrInput_TextChanged(sender, evt);
             UpdatePhoneNrInputVisibility(IsEditing || IsCreating);
         }