How to detect objected being hovered over while Dragging

[LiveWire]

I'm trying to write a script that will cause an icon that I am dragging to change colour if it hovers over certain types of objects in the world.

I understand that UICamera.currentTouch.current will get me the object that is currently being hovered over while dragging. However, I don't know how to access this variable.

It is static, and I cant seem to access it by something like:
gameObject.GetComponent<UICamera>().currentTouch.current

and if I try this I get a null reference exception:
print(UICamera.currentTouch.current.name)


So my question is simple. How do I use this?

[ArenMook]

It's only valid during NGUI callbacks such as OnPress, OnClick, etc. Instead of doing what you're doing, attach a script to your object you want to change color and implement the OnHover function inside.

[LiveWire]

Thanks ArenMook, I had a little trouble figuring out what to put the script on (I'm clicking one icon to start the drag but telling it with the UIDragObject script to drag a different object. So I had to put the script on the clicked object and have it change the colour of the dragged object), but it's all working now. Much appreciated!