I'm banging my head on my desk with this particular binding mistake.. I have checked several on the postings to the BindingExpression route error and can't see something that works with my scenario. On the other hand, the binding over the IncrementingTextBox IsEnabled property is resulting in a BindingExpression path https://maxestatesgurgaonfloorplan.blogspot.com/2025/07/smart-world-edition-gurgaon-emerges-as.html