Item do something on use while in inventory

[AlexanderGrr]

Hi Im trying to create an item which the player could use in his inventory. It would work something like food but it would never perish. I made this: http://pastebin.com/xJQrt1Jh but it doesnt work yet, cant right click it in my inventory. What I am missing?

 

Bonus question what would I need to add to make item usable by only one character like Lucy the axe?