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Using a modified theme hook originally provided by sahotataran I have managed to add my forum categories to the tab bar, which would by default only displays the 'Popular', 'All discussions' and 'Mine' links:
Once I actually click on a category link (as opposed to the 'Popular', 'All discussion' and 'Mine' discussion links), however, the categories disappear from the tab bar:
I actually need to click on one of the discussion links mentioned above to have them re-appear:
How do I modify my tab bar in such a way that the category links will always be there, even when browsing a category?
Thanks in advance!