RachelRachel 133k6767 Gold badges315315 silver badges510510 bronze badges 2 three Rachel, you're a wonderful genius!!! And I am an fool. Thank you much for the solution. I used to be binding to self and did not have a 'ConfigurationModel' property in my IncrementingTextBox class. So your DataContext for "video_length_textbox" is https://landmarkavanasector95.blogspot.com/2025/07/aipl-sector-103-gurgaon-wellness-living.html