RachelRachel 133k6767 gold badges315315 silver badges510510 bronze badges two 3 Rachel, that you are a lovely genius!!! And I am an idiot. Thanks a great deal for the answer. I was binding to self and did not have a 'ConfigurationModel' property in my IncrementingTextBox class. /concept /verifyErrors The word in https://pressplaynewz.blogspot.com