Constrain to UI Panel

[Littlenorwegians]

Hello!

Trying to work my way around an issue. Basically what I am trying to do is ensure that a UIlabel here always stays within the borders of the UI Root's panel.
https://www.dropbox.com/s/o28oj3nq01lo7nz/WithinBorders.mp4?raw=1
(This video showcases the problem quite exactly)

I've fiddled around but I can't really find the "right words" in NGUI to confine this UI element within the bounds.
Very grateful for the help 

[ArenMook]

All the math you need is in the UIDragObject script. Look for "restrictWithinPanel" and how it uses panel.ConstrainTargetToBounds.