Okay I've been experimenting with this quite a bit.
I can actually get the Item Window to appear in the main menu.
Okay let me back up. I want a menu system or at least the coding so it shows the Item window in the Main Menu. I only want the items to go straight down and not sidy by side and down like the regular item.
I did get the item window to appear and I also got it to where I click on items it makes the other windows not active and the item window active. My problem is when I lowerd the width the items were scrunched up in a way.
Here's the layout.

If you can just make the Items Window work in the Main Menu then I can do the rest of the coding.