RachelRachel 133k6767 gold badges315315 silver badges510510 bronze badges 2 3 Rachel, you are a lovely genius!!! And I am an idiot. Thank you so much for the solution. I used to be binding to self and did not have a 'ConfigurationModel' property in my IncrementingTextBox class. 0 and higher) - https://corporatenewshub.blogspot.com