RachelRachel 133k6767 Gold badges315315 silver badges510510 bronze badges 2 three Rachel, you will be a good looking genius!!! And I am an fool. Thanks so much for the answer. I had been binding to self and did not have a 'ConfigurationModel' property in my IncrementingTextBox class. @Kent points out that https://elancommercialsector106.blogspot.com