Hi. Thanks for help. You understood the question right. and that works too! I have read that in help before but it said that "Z" can only be apply for Spinner control. so I had never tested it. well though setting Z makes it blank but when focus come back to textbox it displays again it as a '0'
so I guess its upto the client what does he exactly want. if he is ok with displaying blanks when focus is away then 'Z' is best or else I think we have to use "Blank" command as Nadya Suggested

Thanks
Mark