Force grid column renderer to re-execute.

I have an ExtJS 4.2.2 grid with a column.

The data in the cells is calculated in a renderer using data stored elsewhere. It renders fine.

After the grid has been displayed, the "data stored elsewhere" that is used to calculate the grid cell values changes, so how do I force the cells renderers to be re-executed?

I don't want to refresh the entire table, just the data in those cells.

Thanks in advance!

Force grid column renderer to re-execute.