Qtableview Sorting Fails After Sethorizontalheader()

I am encountering a strange problem with PySide QTableViews after I have set a new QHeaderView instance via setHorizontalHeader(). Specifically it seems that the sorting ability of

Solution 1:

Ok, found out that setClickable(True) will do the trick. Seems to be on by default on QTableView header views but not on instances created manually.