Hi Naresh,
You wrote " Is there a possibility to control the visibility of this F4 help dynamically ? Meaning i would like to hide this F4 help on the start of program [ would like to keep the On Value Request] upon the field."
at start of program if your cursor is on another field, you F4 on required field will not be avialable, when you will go on that field then only F4 will be appear.
if your requirement is different, please elaborate more.
Rg,
Deeps