Version: HEAD (using KDE KDE 3.5.1)
The new UI for the data manager is unclear in what clicking on an item in the toolbox of the left side will do.
At first glance I expected this to filter the view on the right side, but instead it created new entries.
This should be indicated with a short piece of text (such as Create New) above the toolbox.
I said that as well on the list a couple of days ago (http://mail.kde.org/pipermail/kst/2007-January/012667.html), and it seemed to be OK to add the "Create new..." label. Not an issue, I think you can just go ahead an do it :-)
For the rest of the UI discussion, I'd say it belongs in the other bug you just posted (bug #140627)
I cleaned up the dialog and added the label
This has been fixed by Eli in version 629198