[F8] Custom scrollbar with contentstarting ABOVE above y=0

Hi,

My problem is with scrolling vertical content with a custom scrollbar, where the dynamic content often starts at a y value ABOVE the viewer (or mask). I can get the scrollbar to reflect the correct % of available content on the scrolltrack, but for the life of me am stuck allowing scrolling for the full height of the content.

The attached FLA (v8) shows where I’m stuck and how far I got. It’s a much simplified version of the final movie, with static content for now, but demonstrates a case in point.

I can’t use the built-in scrollbar component/s because the content MC will be dynamically populated with further MCs and the content._y value will change constantly, usually ABOVE the 0 y coord of the movie.

I’m going mad with this, and it’s probably easily sorted, but my poor brain has melted. I have looked high and low, but haven’t found the solution, or cleared my brain enough to work it out. I’m waiting for that ‘doh’ moment. Any help much appreciated!