Filter (display only) the selected content types

Hi,
I think it's quite easy to understand what I want. Instead of having a tab for each content type, give the option to just select the content types you want to display in the xtracker page. That way, one can have content types without use, and the users don't get another tab for nothing (most of the time, with no nodes inside..).

Anyone has an idea on how to do that?
Thanks!