It's a connection refresh button which i renamed as show button. I got your point but what I am trying to say is, even for the first time when user has not entered any values the message is displaying when i followed the steps suggested by you..
So I would like to display it only when the user is trying to click on show without entering the supplier, same as how you fill any registration form which will alert you to enter any mandatory fields before submitting the form.
Hope you understand!!... Appreciate your help and time 
Regards,
Vennela