Trouble using hidden items with dummy abilities

To whom ever reads this

I'm tyring to activate an item using a dummy ability but the trouble is that it doesn't work when I use a permanently open bag type item to hide the other item. Does anyone know of a solution to my problem?

Thank you for your time & any help would be appreciated.

From my understanding of the problem, you should make a trigger that pretty much says:

Events: A unit uses an item.
Conditions: Item is equal to (your item)
Actions:Create a dummy unit(with needed spell already) at point of triggering unit
Have dummy unit cast (spell)

I'm sorry if I wasn't clear enough but the hero doesn't actually use the item because the second item hides it. The item is used via a triggered ability. The reason I want it done like this is because it doesn't like leveling up abilities inside a spellbook when there is more than one spellbook.

I suggest you use dummy units with dummy abilities, not dummy items with dummy item abilities.
From personal experience units are easier to manipulate.

I just thought of an alternative solution to the entire problem. This isn't the major problem but it was a minor problem in an attempt to get around it but this doesn't matter anymore. Thank you for your help Orc Dork & Rising_Dusk.

I have no idea why anyone would think dummy items is a stupid idea.

I can't see any posts saying that they are stupid but I do see a suggestion stating that dummy units are easier than dummy items. Also my alternative solution didn't work, so I still need your help with this problem.

Edit: Would using a shortcut key work as a possible solution, I would test it myself but I don't have my laptop with me.