Itemid shows, but the config is set to none

I install custom properties for joomla 2.5 and set in the config:
Use Itemid: None.
In the plugin "Content - Custom Properties Tags Plugin" the option itemid is blank.

But the tag link in the pages append at the end of the url "?Itemid=356".

Like this: www.biodieselbr.com/component/customprop...s-agrenco?Itemid=356

Am I missing something?

How to not have the itemid in the urls?

There's a parameter in *component* config that controls globally whether Itemid is to be used or not. (modules and plugins have their own Itemid parameter to force the use of a given Itemid)

Thanks, but as I said, in the config of the component I set this parameter "Use Itemid" to None. But still shows the item id.

And in the plugin "Content - Custom Properties Tags Plugin" the option itemid is blank.

I can't tell who is appending that 'Itemid' param to the URL. I can't find any mod_cpsearch / mod_cpmenu / mod_cpcloud on your site.