You cannot access row/col by label text, but you can specify custom row/col ID (which I believe you mean anyway):
http://www.activewidgets.com/messages/177-10.htm
Then you have to update the item in your data array:
myData[i][j] = newValue;
and refresh a single cell:
grid.getRowTemplate(i).getItemTemplate(j).refresh();
This topic is archived.