RachelRachel 133k6767 gold badges315315 silver badges510510 bronze badges 2 three Rachel, you might be a wonderful genius!!! And that i am an idiot. Thanks a great deal of for the answer. I was binding to self and didn't have a 'ConfigurationModel' property in my IncrementingTextBox class. Day by day, weekly https://share.evernote.com/note/f404b8b9-8407-e9b8-74a2-7bb0637d59f3