void GeographicPolylineLayer::LoadAndActivateExteranMaterials()
{
    m_materials.clear();
    m_tileGenerator->GetMaterials(m_materials);


    // TODO: need to remove this
    //return;

    if (!m_materials.empty() && m_listener)
    {
        // Tell NBGM to load all materials.
        //for_each(m_materials.begin(), m_materials.end(),
        //         bind1st(mem_fun(&GeographicLayerListener::MaterialAdded), m_listener));

        for (auto material : m_materials)
        {
            m_listener->MaterialAdded(material);
        }

        // Tell NBGM to activate the second one.
        m_listener->MaterialActivate(m_materials[m_polyline->IsSelected() ? 0 : m_materials.size() - 1]);