Possible Culling Problem

Coding4Fun posted code called "BattleTank 2005", it gives a great example for simple camera movement and importing of Xfiles. The Xfiles are all white because no lighting is provided in the prog. I added these lines to allow for lighting

taken from http://www.gotdotnet.com/team/directx/learn/tutorials/helloteapot.aspx

            device.RenderState.ZBufferEnable = true;
            //    enable lighting
            device.RenderState.Lighting = true;
            //    set the ambient color
            device.RenderState.Ambient = Color.Gray;

            //    configure a directional light
            device.Lights[0].Type = LightType.Directional;
            device.Lights[0].Direction = new Vector3(2.0f, -1.0f, 0.0f);
            device.Lights[0].Diffuse = Color.White;
            device.Lights[0].Enabled = true;
            device.Lights[0].Update();

note that the last line used to be .Commit() but DirectX 2.0.0.0 doesnlt have a .Commit() method.

This kind of works, but the objects have what looks like culling issues, though in the BattleTank example culling is set to None. Anyone got any Ideas