Okay, so I’ve had the same problem now for three months, and today my last attempt at solving it was brutally thwarted by the stupid coding problems within Flash.
My problem was (still is!!) that I have a big movie clip with a limited amount of space on my stage. So my first thought was to place this movie clip inside an instance of the scrollPane component. Unfortunately, my movie clip contains several instances of the comboBox component - which do not work if your movie clip is placed in the scrollPane component.
So, okay, fine. I figure there has to be some work around for this. I will simply create my own scroll bar. Scroll bars work great, unless your movie clip happens to contain comboBoxes. When you mask a movie clip that contains instances of the comboBox component, these instances do not work.
I have posted several questions regarding this problem during its myriad stages of development, and no one seems to know the answer. So I am now trying to give it one last try. God bless anybody who happens to know the answer to this problem and is willing to share their enlightened understanding.