OK so a if I understand you correctly…
The way I would do it is to place a hidden object at the point in the panel where you want the sticky header to appear. Then have an onscroll event on the dynamic panel populate a widget that you can then read the Y scroll value from. Then use conditional statements on the onscroll to show/hide the static and sticky versions of the header when you want that to happen at a certain point in the scroll.
Here’s a very simple demo of what I mean (using Axure 8 though as I don’t have 9): siticky.rp (53.9 KB)