Thanks Fred for reply !!!
I have one custom table in this table there are two columns like employee id and employee first name. Employee Id is having f4 help. I have bind Employee Id to Employee Id field. When we click on f4 help and then selects employee id first name automatically comes on first name column. For this i have written code in Event-After modify of my node.
When i am adding row then it appears f4 help name instead of appearing at the time of selecting f4 help close. Kindly suggest on this issue.