If you need to call a function from the current scope
TimSymons's hack will work "comme un charme". But, if the object is
not in the current scope(like another class instance) you will
probably need something like that :
objFunction is an Object to callBack
strFuncToCallBack is a String with the name of the method to
arrParams is a one dimension Array([1,2,3...]) with
you want to pass(if no arguments use  or new Array())
it's important to keep the cast to Function type like
TimSymons said. Unfortunately, eval() doesn't work great in Flash.
His behavior is really different from the Js eval() and in this
case it won't work.