RachelRachel 133k6767 Gold badges315315 silver badges510510 bronze badges two 3 Rachel, you will be a beautiful genius!!! And I am an fool. Thanks so much for the answer. I used to be binding to self and did not have a 'ConfigurationModel' property in my IncrementingTextBox class. @property is a tool https://m3msector57gurugram.blogspot.com