RachelRachel 133k6767 Gold badges315315 silver badges510510 bronze badges 2 3 Rachel, you're a lovely genius!!! And that i am an fool. Thank you much for the solution. I had been binding to self and didn't have a 'ConfigurationModel' property in my IncrementingTextBox course. So your DataContext for "video_length_textbox" is about https://sites.google.com/view/centralpark104sector/