MD3D PatchMesh class...

I''m having trouble with the Managed D3D PatchMesh class; when I tell it to tessellate, it throws a null reference exception. Are there any tutorials where I can get an idea of how to properly use the PatchMesh class? Here''s my code:

				PatchMesh m = PatchMesh.CreateNPatchMesh(mBase);
				int faces = (int)(mBase.NumberFaces * Math.Pow(mDetail,1)),
					vertices = (int)(mBase.NumberVertices * Math.Pow(mDetail,1));
				mMesh = new Direct3D.Mesh(
					faces, vertices, 
					MeshFlags.Managed, 
					mBase.VertexFormat, mRenderer.Device);
			//	Direct3D.Mesh.TessellateNPatches(tmp, mAdj, 2, true);
				m.Tessellate(mDetail, (Mesh)mMesh);
				m.Dispose();