ActionScript 3.0 :: Return Class Instance As String

Is there anyway to include a function or overrite something in a class that'll output a custom string when the object is called as a string?

So for example if I created a class named "myClass" and I instantiated it:

Code:
var myObject : myClass = new myClass();

When I:

Code:
TextControl.text = "blah blah, " + myObject;
myObject is getting casted as a string. Normally it would output:
"blah blah, [object myClass]"

Is there a built-in function that recast the object as string? Is there anyway for me to change that string output? I know I can just make a public toString() method in the class or something, but just wondering if there was something better.