How to Increase the width of Row Number coulmn?

As i have more number of coulmns and more number of records , I need to show three digits row number. But after row no 99, its showing 3 dots '...' instead of 100. How to fix it?

Are you settings columns widths in the style sheet?
I think IE is the only browser that adds the ...

I think you want this?!

obj.setSelectorVisible(true);
    obj.setSelectorText(function(i){return this.getRowPosition(i)+1});
    obj.setSelectorWidth(obj.getRowCount()>100?18:15);

HI,
This below method is working fine. Thanks
obj.setRowHeaderWidth(50);