>>Please tell me what is the best way to do it.. Should I have the ON KEY LABEL in the 'When' method and call the 'Right Click' method from there? Any other neat way to do this?
>
>I'd consider puting it on a Menu with F1 as a short cut key. What type of help are you using? Do you use HelpContextIDs?

I do not use HelpContextIDs.
When the focus is on that field., on pressing F1, it should show the list of codes and the description and be able to select from it.

After moving to the next field, the F1 key should be deactivated.

Thank you.

Leo