Age Verification?

I know that in RMS you can set it up under...I forget, I want to say messages or something like that where when selling a certain item, the clerk is alerted with a message if it's something you don't want them to sell, or if it's for someone under age...what have you...the problem is if a clerk scans, does not pay attention and scans another item, the dialog box is closed, and the next item does not even get recorded, therefor making this useless to me. I am wondering if anyone knows of a way to make the dialog box stay and not allow it to be scanned over? Like when an item is not in the database, the dialog box will not allow another scan to go through, until escape is pressed...perfect if I could do that with the messages dialog. If nobody knows how to do this, can anyone recommend an affordable add-on which is based on age verification, I don't need anything fancy, basically what RMS has, but locking the dialog box...if someone want's to do this, I am willing to pay for it? Thank You, Vince