Demo "example" with inventory?

Still cant get it to work properly.  Would be very happy if somebody could make a "demo"  with a simple pick up item, put in inventory and use item to open a door demo  cant see the logic in it yet  

It depends on whether you use commands or just click on stuff, a Monkey Island 1 UI works differently to a HOG type UI
Glen's tut if you try to use the Sam and Max type UI which comes later on, the original system fails
This is a 1st person type inventory which activates with right click, you get the inventory item from the brief case, just turn the first dial to 5

use the file inv item on the door
This is really simple I have the MI1 style also