Hi Gadberry,
After adding a sortdirection to a column you should re-render the grid.
However, when you would attempt to re-render the grid in a behavior function you will find yourself in an endless loop (re-rendering will ultimately result in executing the behaviors.....),
so.....try to set the sortdirection to the column you want to be sorted before setting the datagrid's data, or do a re-render of the DataGrid.
Regards,
Guus
gweis