Define the class at runtime?

Hi,
is it possible to do something like the following:
    public function readGenericClassEntity(myClass:Class,ac:ArrayCollection):void{
        var entity:myClass=myClass(ac.getItemAt(dataGrid.selectedIndex));
The part "entity:myClass" gives a compiler error:
     Type was not found or was not a compile-time constant: myClass.
So is it possible to define the class at runtime?
Thanks for any pointers!
Martin Zach

Hi Jason,
thank you for your answer, one possible solution.
I used the solution from:
http://thillerson.wordpress.com/2007/03/01/runtime-class-instantiation-in-actionscript-30/ #comment-951
Thank worked fine for me!
Cheers!
Martin Zach

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