I thought I'd replied but it looks like not. What's missing for me in these systems seem like they don't usually map the program to manage the behavior of the w

I thought I'd replied but it looks like not. What's missing for me in these systems seem like they don't usually map the program to manage the behavior of the widget with the layout of the widget. Am I wrong? I really like that I can build a custom widget that encapsulates the entire behavior of the widget not just how it looks.