Panel < UIWidget phantom: true FlatPanel < Panel border-image: source: /core_styles/images/panel_flat.png border: 4 TopPanel < Panel height: 34 image: source: /core_styles/images/top_panel.png repeated: true RoundedPanel < Panel background-color: #ffffffdd border-image: source: /core_styles/images/panel_rounded.png border: 4 RectPanel < UIWidget image: /core_styles/images/empty_rect.png