RachelRachel 133k6767 gold badges315315 silver badges510510 bronze badges 2 3 Rachel, you are a lovely genius!!! And I am an idiot. Thanks a lot of for the solution. I used to be binding to self and didn't have a 'ConfigurationModel' property in my IncrementingTextBox class. This Web site is using https://adoreluxuryprojectsgurgaon.blogspot.com