In my GXT2 project I have extensively used a grid with row editor. I appreciated very much the ability of the row editor to monitor the current input in editor fields and display the appropriate error messages in a tooltip (they were gathered together from all editors and shown as one message).
In GXT3 GridEditing I haven't found any similar solution. Am I missing something or should be the input in GridEditing fields validated somehow differently? Was the tooltip-like validation removed?