RachelRachel 133k6767 gold badges315315 silver badges510510 bronze badges two three Rachel, you are an attractive genius!!! And I am an idiot. Thanks so much for the solution. I was binding to self and didn't have a 'ConfigurationModel' property in my IncrementingTextBox class. I quickly discovered, obviously, that this doens't operate: https://emaarscoplotssector75gurgaon.blogspot.com/2025/06/signature-global-plots-farukhnagar.html