Fixed right cannot be adjusted by mouse using selector

Hi

I am able to use selector in the left fixed column to drag them to right and increase the width of that column.But, when I try to do the same for right Fixed column, I am not able to adjust the width by dragging it to left.

I am using following to fix the right and left columns.

obj.setFixedRight(1);
obj.setFixedLeft(1);

Please help in this problem

Thanks
Vikramaditya Garg
Fidelity India