I needed to display the sort arrow by default as it was not showing when the grid loaded. I was able to get it to display but now when you click on another column, the grid re-sorts but the arrow stays on the default column.
dhtmlxgrid: //v.3.6 build 130619
So in the example, the sorting arrow does appear in the Date To column which is correct but then if you were to click on the Date From column you notice that the flag stays on the Date To one.
Thanks in advance.