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Null reference exception thrown when clicking on check box in AddNewRow before AddNewRow is initiated. Clicking on checkbox after the addnewrow initiated, working fine.  
Reproduce Steps:
1) Run the attached sample. 
2) Move to check box column of AddNewRow. 
3) Click on the checkbox in AddNewRow. 
Observed Behavior: Null reference exception occurs on clicking checkbox.
Expected Behavior: Exception should not be raised. Checkbox state should be changed properly.