Thanks for all the replies, you have all been helpful.
Another question: If I am legally carrying concealed and someone notices my weapon, can I be arrested for open carry?
Depends on your state. In PA we have open carry, so if somebody notices your gun it's no big deal.
AT the other end of the spectrum we have what happened to that guy in the Las Vegas Costco
In Texas that's called printing and yes if they can see it your brandishing in violation of the law. What you should do is immediately leave the area and fix it.
Like PapaBear said it completely depends on how your new WI law is written. In FL it use to be that you would be in trouble. They just passed a new version here so now you have a little protection.