iGrid Column width

Hi,

In my iGrid,I have 5 static columns as BatchNo.,Drop DateTime,Date Time,Drop Qty,Moisture

and several columns which are dynamically created.

I want to hide the Date Time which is my third column on certain condition.I am using

document.iGrid.getGridObject().setColumnWidth(3,0);

but it is not working.

Just to check I also tried using document.iGrid.getGridObject().setColumnWidths(0);,but this is also not working.

What can be the problem.

I am also using

document.iGrid.getGridObject().setColumnHeadings(NEWVALUE); to set the column headings.

Thanks,

Anuj