ActionScript 3.0 :: Call A Class Constructor Dynamically Using Factories?

I'm attempting to call a Class constructor dynamically using factories:

ActionScript Code:
public function construct(classRef:Class, initArgs:Array):* {
var factory:ClassFactory =  new ClassFactory(classRef);
var classInstance:* = factory.newInstance();
return classInstance;
}

This works just fine, except when the constructor of the classRef being passed in requires arguments, as in the sample class below:

ActionScript Code:
public class Foo
{
public function Foo(arg:String) {

[code]....

Is there any way I can call construct(Foo, "Hello World") and have it properly pass the parameters to Foo's constructor? (I'm not locked in ClassFactory, by the way, I also tried classRef.apply(initArgs) and a few other hacks to no avail.)