Dynamic, XML-based OOP Quiz

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hello-

i've been banging head against following wall...

i'm developing dynamic online as3 quiz application delivers number of different types of questions physics problem (demo here: http://www.tc.umn.edu/~ehoover/physics/v2/testmodule.html -see answer key below). quiz data coming xml documents (one each section) , application structure object-based following hierarchy: parent .fla > module > section > quiz > question. parent .fla contains single module instance in turn contains number of sections (usually 5). each section contains number of quizzes contains number of questions.

the user proceeds through module answering questions fork in road can choose number of different physics approaches (so it's branching quiz) solve given problem. eventually, possible choose more 1 approach solve given problem , in order user must allowed follow branch it's conclusion. if approach isn't sufficient solve problem on own, user returned impasse question , allowed select different approach.

which problem lies: after selecting insufficient/incorrect approach, user returned approach impasse , question displayed expected, question interface appears disabled.

it's not practical post code here, i'd happy make available wishes help.

thanks!
-erik

answer key:
q1: 1
q2: 1
q3: 2
q4: 2 (others valid, sake of expediency choose a2)
q5: valid targets ai, m, ff, w, fn



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