It will be very good if you add property to the grid, because it is comfortable use hidden fields,
by the way I read in your knowledge base that function setColumnHidden works slowly.
P.S. I see js error:
mygrid.setColumnHidden is not a function
[Break on this error] mygrid.setColumnHidden(1);
>>P.S. I see js error: mygrid.setColumnHidden is not a function
Which version of grid you are using ? The setColumnHidden method available only in pro version.