Can't add a layer group to the layer control

[bwyss]

I am able to add the layer to the layer control, but not a layer group.

here is a snippet of what I am trying to do:

        var layerControl = L.control.orderlayers();

        var tileLayer = L.tileLayer(TILESTREAM_URL +
            selectedLayer +
            '/{z}/{x}/{y}.png',{wax: TILESTREAM_URL +
            selectedLayer +
            '.json'});

        var utfGridLoss = new L.UtfGrid(TILESTREAM_URL +
            selectedLayer +
            '/{z}/{x}/{y}.grid.json?callback={cb}', {Default: false, JsonP: false});

        var utfGrid = L.layerGroup([
            utfGridLoss,
            tileLayer
        ]);

        map.addLayer(utfGrid);
        layerControl.addOverlay(utfGrid, selectedLayer); // does not work
        layerControl.addOverlay(tileLayer, selectedLayer); // works

[bwyss]

I was able to get around this issue by using a leaflet featureGroup, but the UtfGrid layer does not follow the layer order change