Some help with the Command Chest plugin

I've recently started using the plugin Command Chest (http://dev.bukkit.org/bukkit-plugins/chest-commands/) and I have a few questions about it.

I've been having a big problem with getting the plugin to open other GUI menus like echo pet's /pet select and ParticleMenu's /particlemenu. I see in the console that I executed the command, but the menu doesn't open.

I'm also curious if there is a way to be able to require more than 1 item. This could be used if you wanted to make a shop to exchange different music disks to get ones that you like. Does anyone know if this is possible?

 

1) Just run the commnad "/pet select" as op .
2) the same with "/particlemenu"
3) I don't know

 

@MaTaMoR_
That didn't work ;-;

When I do the command it says : "pale1 issued server command: /particlemenu" but the menu doesn't open.

EDIT: I fixed the problem with the opening of the other menus. It turns out, I needed to use the "KEEP-OPEN: true". I found that out during lag when I saw that the particle menu had opened and closed right after.