tables and table headers

I am having difficulty getting table headers to show up in the GUI.  I
have a table that I am initializing through a table model.  That part is
working just fine. 

I tried using the tableheader tag, and initializing it using a
tablecolumnmodel.

I also tried not using a tableheader tag, and adding columns to the
tablemodel. 

Any help on this subject would be greatly appreciated.