I have been trying to find how to override the Categories tab. I cant seem to find the ascx that renders it. Anyone got an idea where it can be found?
I think it's the TabStrip control on Editpanel.aspx that generates the tabs.
I'm not sure but I think that the builtin tabs are just normal Editpanel plugins.
If you do a program that get all plugins for "EditPanel" with the PluginLocator.Search("EditPanel") i think you could find out which control that renders the categories tab.