Thanks For Reply tony
I just want to apply the same Header group on first and last Column.

According to documentation we have to tell the total number of column to be grouped and these column should be at next to each other.

In my case i have 2 column to be grouped and these columns are not next to each other and Sortable Column is not Allow in my case.

I hope you will understand my problem.

Finally Solve the problem .

Actually ColModel was not updated properly.There was some

I already try this But its not working i am fetching data from http://ws.geonames.org/searchJSON