Confluence Dashboard customization...

I'm trying to find where the "star" to add a space as favourite is added to the list of spaces on the dashboard. I've added some extra tabs to clasify the list of spaces, but I'm not able to add the option to set a space as favourite on these new tabs.

Does anybody know where it is added or how?

The version of Confluence I'm using is 3.4.3

Thanks in advance.