Problem with wall styles / hatch in autocad architecture 2012

Hi,

Im using Autocad architecture 2012 and i have a little problem, i wanted to hatch with black color certain wall only (the perimetral ones) hovewer i having problems with the walls cleanups, something like a triangular shape.

I made the hatch editing the wall style.

Any idea about how to solve that? (see image attachment)

http://imageshack.us/photo/my-images/225/acadproblem.jpg/

http://imageshack.us/photo/my-images/576/acadproblem2.jpg/

Excuse my terrible english, its not my natural language.

Thanks in advance!

Grettings

I am not sure what you are asking. Are you trying to make them a solid flat surface (minus the triangle shape)?