RachelRachel 133k6767 gold badges315315 silver badges510510 bronze badges 2 3 Rachel, you're a lovely genius!!! And that i am an fool. Thank you so much for the solution. I used to be binding to self and didn't have a 'ConfigurationModel' property in my IncrementingTextBox class. MaartenMaarten 23k33 gold badges5151 silver https://elanthemarkgurugramproject.blogspot.com