Please help:Adding RenderMaterial won't Undo

@pascal or @nathan can you help with this?

I am making a script to make some glass panels and I have made a definition to add a material if it doesn’t exist, and then assign it to an object. It works (but was a pain to figure out, I wish it was a simple rs.IsRenderMaterial(name) ,rs.AddRenderMaterial() option…)
But the problem is that if I undo the script then the material is still there.

And if I run the script a few times and delete the material a few times and undo a few times more after that then MORE identical materials pops up in the material list… with the same name. Isn’t that strange?
Do I have to add some stuff to make the creation of the material undoable?
Is this a bug, or are there better ways to do what I want?

def addMaterialToObject(obj_id):
    render_material = False
    matTable = sc.doc.RenderMaterials
    for mat in matTable:
        if mat.Name == "hh_GlassPanel":
            render_material = mat
    if not render_material:
        rhino_material = Rhino.DocObjects.Material();
        rhino_material.Name = "hh_GlassPanel";
        rhino_material.DiffuseColor = rs.coercecolor((200,240,235))
        rhino_material.Reflectivity = 0.9
        rhino_material.Transparency = 0.9
        print dir(rhino_material)
        # Use the Rhino material to create a Render material.
        render_material = Rhino.Render.RenderMaterial.CreateBasicMaterial(rhino_material, sc.doc)
        sc.doc.RenderMaterials.Add(render_material)
    rs.ObjectMaterialSource(obj_id, 1)
    obj = sc.doc.Objects.FindId(obj_id)
    obj.RenderMaterial = render_material
    obj.CommitChanges();
    sc.doc.Views.Redraw()

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