I've did your instruction for the hidden item, it work. Thanks.
I'm going to try your method for the tileset.
Cause this was what happened when I did what I had did for the past few days;

The white selection box will either be like the 2 left image, and not like the right image.
I was sure I had did something wrong, but couldn't figure it out.
Sorry if I sound dumb, I'm still in the process of learning the program.
Edit:
I've tried adding the barrel tileset into the common files as per instructed. But I'm still having the same issue. Would you mind explaining how to edit it as been said have to do it manually? So that its properly registered for use in RPG Maker VX. Thanks.
This post has been edited by Prectorian: Aug 27 2011, 04:28 AM