It's their property however they shouldn't have done that, maybe they were given strict instructions on not letting anyone move the bike. You should have asked for permission first but still they should have just kept calm and diverted the situation by saying "sorry sir but we cannot let you move the bike". The fact is most of the people here are uneducated and they don't know how to treat their customers, which should be done with utmost respect. When I went their I just took some pictures and asked if I could start and rev the bike and check all the lights etc and they let me do it. At that time they had only one bike at their showroom and it was on a pedestal so I couldn't check by riding it.
Other dealing with them went smooth such as paying the advance and getting the bike on time. A young person deals all this and I think he is the son of the owner. He dealt with me very professionally.