Hello

When I do an interior elevation, the boundary snaps to the wall limits. That is fine but as it snaps to the outside wall face (outside from the compartment) the wall patterns disapeer. When the boundary is inside the wall, the patterns shows up.
Is there a way to control this?
What I need is to have the interior elevation to snap to the external wall faces and show the patterns.

I'm using Version 2009.

Thank you for your help