The new Data Grid is fantastic, but the fact that you have to add an ActionColumn and that that is the only one that can have an OnClick handler attached is quite limiting. It would be very nice to have the option to do the following:
1. Add an OnClick handler to each column regardless of type
2.Add an OnClick to an entire row so that they can click on any column and it triggers the handler
I would suggest that the Cell OnClick overrides the row one... but the individual cells click probably more important. Or potentially just allow one or the other.