RachelRachel 133k6767 gold badges315315 silver badges510510 bronze badges two three Rachel, you happen to be an attractive genius!!! And I am an idiot. Thank you so much for the solution. I was binding to self and didn't have a 'ConfigurationModel' property in my IncrementingTextBox class. @Kent points out that Properties https://retailshopyamunaexpressway.blogspot.com/