RachelRachel 133k6767 gold badges315315 silver badges510510 bronze badges two 3 Rachel, you might be a lovely genius!!! And I am an fool. Thanks much for the solution. I had been binding to self and did not have a 'ConfigurationModel' property in my IncrementingTextBox class. So your DataContext for "video_length_textbox" is https://luxuryhomesgurgaon.fitness.blog/