Hide a column from tree grid

how we can hide a column from dhtmlxTreeGrid. Fot this, i try to put a width Zero for this particular column . it works well in IE but does not work in Firefox 3.0. I am using your dhtmlxTreeGrid - Enterprise License. Please help.

Both grid and treeGrid supports
which hides column in question
dhtmlx.com/docs/products/dhtmlxG … 6312240000

Mass setting can be done by grid.setColumnsVisibility

Thanks for your help. Its very helpful to me and my team.