Programatically change cell background

Can someone tell me what call I would need to make to change a specific cell's background color ? I know the x&y for the cell in my function
This will NOT be done from a 'mouseover' event.
I've seen some great examples but none that quite tell me what I need to do.

I expect I will need to do something like
cell.SetBackgroundColor(x,y,"red") or something.

Can anyone help ?

something like this -

grid.getCellTemplate(col, row).setStyle("background", "red");

works like a charm!

thanks