@Override
protected void doGetRestorableState(RestorableSupport rs, RestorableSupport.StateObject context) {
super.doGetRestorableState(rs, context);
RestorableSupport.StateObject so = rs.addStateObject(context, "layers");
for (Layer layer : this.layers) {
RestorableSupport.StateObject lso = rs.addStateObject(so, "layer");
layer.doGetRestorableState(rs, lso);
}
}