step for use:
1. put medical items inside the first aid kit.
2. assign the first aid kit to a number on the shortcut bar.
3. click on the number for put the first aid kit in your hands.
4. active your scroll menu and select a action. (don't show same action multiple time if you have several times the same item inside)
effect:
(you will take out in your hand the item associated with the action selected and temporary put the first aid kit on the ground(or put it back in your inventory) will the action is playing. after this, your used item will by put back inside the first aid kit, if not all consumed, and you will take the first aid kit back in your hands.)