Dynamically alter grid cell to combobox

We are using the grid to display potentially quite large rowsets (2000 rows) in virtual mode. However we want one of the cells in a row to be a combo box. We can of course loop over 2000 rows and set the cells but this is very slow.

(i.e)

for (i=0;i<2000;i++)
{
obj.setCellTemplate(new AW.Templates.Combo, 1,i);
}

Alternatively we can dynamically alter the cell template in the onCurrentRowChanging and onCurrentRowChanged events to be a combo box only for the current row. Then for the row we just came from, we turn it back into a standard text cell.

This does work - and is by far our preferred solution - but we have to call the grid's refresh method every time we do this or the new combo box does not display. This is very slow for a 2000 row grid even in virtual mode, and before scrolling, so this is also not ideal.

Is there a better way of achieving this?. Can we refresh just the active row (and possibly the row we came from?)

You can assign the cell template using only column argument -

obj.setCellTemplate(new AW.Templates.Combo, 1);

In this case the template will be assigned to all rows (column-1).