thanks – FWIW, tooltip seems to be somewhat incompatible with grid. on a slightly larger grid, the tooltips would take several seconds to open, probably because of the grid javascript overhead.
so i am going with title
instead.
it would be nice if a future version of grid had a way to insert text information in a notes field like many spreadsheets have, where you see a little red triangle marker in the lower-right corner of the cell indicating there are notes associated with this cell.