Changing column values without refetching data?

I have checkboxes above the grid that let folks turn columns on and off.

Is it possible to change obj.setColumnValues and have it re-render the table without re-fetching the data? That is, I am doing a obj.refresh() after I change the column values. Is there an alternative that will tell it to redraw without refetching?

Thanks!

I believe I answered my own question. obj.refresh() just re-renders using the current data -- it doesn't refetch the data, right?

Yes, correct. The 'refresh()' function updates html on the page with the current state of the js object.