RachelRachel 133k6767 gold badges315315 silver badges510510 bronze badges 2 three Rachel, you will be a lovely genius!!! And I am an idiot. Thanks a lot for the solution. I used to be binding to self and did not have a 'ConfigurationModel' property in my IncrementingTextBox class. So your DataContext for https://terraeleganceintapukara.blogspot.com/