!HELP! I can't delete a railing
So i just built a house and the master bedroom was on a split level on the bottom. Then i decided to get rid of the split level and add floor on the top of the bottom level. Every thing was covered but i couldn't delete the railing for the stairs going into the split level. I could delete the stairs but the railing remaind. I used the sledgehammer and click on the railing and it said cant delete
(link on making a split level house)
http://www.youtube.com/watch?v=_dm7FOJG6Pk
HELP!!