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Its really a great approach. However, there is only drawback that needs modification. A user double clicks on a field, changes it.. and now as per this approach, he is bound to press 'return/enter' key to make his change permanent, if possible can't we do it also be some other keys say on pressing 'Tab'. So that the user can make changes to multiple grids. The 'Tab' can navigate the user to next field as well as make his changes permanent.