Dynamic Variable Name Question (quick and painless)

I’ve had troubles with dynamic variable names in AS3. Though i’ve figured most of them out, this instance still gives me problems:

for each(var quest in questObject)
     var classRef:Class = getDefinintionByName('list_item') as Class;
     var questItem:MovieClip = new classRef();

How would I syntactically solve the dynamic variable problem using the above example?