Features / Usability

Hi, I would like to set up a tracker: I need to allow the users to sort its elements. For example, Tiki uses some arrows (up and down) in some admin sections ("edit this tracker's fields" in the tracker admin section; or to sort the menu entries in the menu administration). When I view my tracker I see a field 'Action' (like the one of the menu administration), but it doesn't contain the up and down arrows (but it contains the 'remove' and 'history' buttons). You can see that in the attached image. How can I set up a tracker which allows me to sort its elements? Thank you!