I noticed the following issue with the cell grid.
When you click inside a textfield or datefield and change the value and then click a button in the same row, the click event is not triggered on the first click
(You have to click twice for the event to be triggered).
You can see this behaviour in the GXT 3.1 showcase of the cell grid (www.sencha.com/examples/#ExamplePlace:cellgrid).
1. Click into the datefield of the first row (2012-03-15)
2. Change the value to 2012-03-14
3. click the button("Bloodroot") in the same row
I tested it with FF, IE9 and Chrome.