localToGlobal not updating

Hi All, I am currently working on a curved scrollbar. I want to limit the travel of the scroll thumb using two clip instances that mark the top and bottom of the scroller. To do this, I believe that I’ll need to use localToGlobal on my top (topMark) and bottom (botMark) markers. Unfortunatly, my attempts to get the global coordinates has failed. I am hoping that one of you can guide me to a solution. In the attached file, the code can be found in the actions layer of the curvedScrollbar clip. Thanks in Advance.