Resizeing a coloumn width - Adobe live Cycle Designer

Dear Community Members,

I am very new to Adobe LiveCycle, and trying to develop a dynamic form which works for SAP ByD.

The Scenarion is I have a table with 8 coloumns in it..

On a certain condition two out of 8 fields needs to be hidden (Perfectly done) .

Now I have to increse the width of 3rd column width so that table fits in to page printout.

I tried doing something on sub form 'initialize' event..

$.coloumnwidths = 30mm 30mm 30mm 30mm 30mm 30mm.

But it only change the width of first coloumn (Which I dont want to Change) I want to change the width of 3rd coloumn only.

A help on this will be highly appriciated..

Thanks In Advance.

Ashutosh