"Can't assign the UI prefab's Shift left Button as the Linked Button " Inventory Tutorial

SkyTree

Just bought your kit.
 
 Going through the Inventory Tutorial and can not assign the UI prefab's Shift left Button as the Linked Button or the other UI prefab's Shift right Button as the Linked Button. It just won't assign.

Using prefab InventoryBar from my project window where I dragged it previously and made sure that I used it for the Linked Canvas and RectTransform boundary fields.

What gives?

SkyTree

http://www.adventurecreator.org/tutorials/creating-inventory-bar-unity-ui this tutorial.
using unity 5.0.1f1

SkyTree

I've redone the tutorial now I can assign the UI prefab.

But the items I pick now do not show up in my custom new inventory. Instead they go to the AC default inventory. How do I assign the items to go to the new custom made inventory?

SkyTree

Ok, this is solved too.

ChrisIceBox

Glad to hear it - let us know if you need any more help.