Requiring Users to complete

We create our content in Flash, but use Lectora as the section navigation to launch each section. The page forward and back for each section are in Flash. I want to require users to go through each section completely before being able to continue. I can do this by disinheriting the buttons for each section and usingon (release) { getURL('javascript:trivNextPage()') }But if the user steps back to a previous section, the sections they've gone through already get reset and they have to go through the course again. I also tried setting buttons to be invisible at first and only visible when the user reaches the section, again by the code above, but the same thing happens. If the user steps back to a previous section the sections they've gone through disappear.Is there a way to keep the section buttons from disappearing once the user has gone through them?