Making Puzzle Items Consumable

[Homicide13]

I want to make a puzzle item consumable, meaning that if it is clicked on in the inventory it immediately causes an effect (much like a can of oil or health potion, though the effect would be done through script). However I cannot find a callback that would trigger when the item double clicked (so that the player holds it out in front of him). My idea was that I would use script to remove the item when it was clicked in this manner, so that it would appear to have been drunk.