Dynamically creating a UIButton throws an exception

[appminis-mike]

I'm trying to create a UIButton at runtime:

1. NGUITools.AddChild<UIButton>(parentObject);
2.  

This throws an exception, as the TweenTarget is not set. I don't see a way to set it, though, as the AddChild call itself throws the exception.

Is there a way to create a new UIButton in a script without causing an exception?

Thank you.

[ArenMook]

parentObject.AddComponent<UIButton>();