Deleteing Civil Cell leaves behind terrain

Hello,

When I place a 3D civil cell I've made, then delete it, the object is removed from the tree view and the 2D view, but it remains in the 3D view.  I can select it in the 3D view, even drag points on the mesh around and deform it, but I can't delete it.  All I can do is view it's properties.

Any knowledge on how I can avoid this from happening?  Or how I can regenerate the 3D view somehow to get rid of these artifacts?  The only thing I knwo to do at this point is start over with a new file.