adding/removing grid layers using L.control.layers() control

leaflet_grid-tile_control

<script type='text/javascript'>
    //JLC additions
    gridControls = {}

	var map = L.mapbox.map('map', 'geointerest.map-dqz2pa8r', { zoomControl: false }).setView([17.1456, -87.0029], 8);
	map.options.maxZoom = 13;map.options.minZoom = 6;

	map.legendControl.addLegend(document.getElementById('legend-content').innerHTML);
	new L.Control.Zoom({ position: 'topleft' }).addTo(map);
	L.control.scale({ position: 'bottomleft' }).addTo(map);

	L.control({ position: 'topleft' })
	map.attributionControl.setPrefix('<a href="http://www.naturalcapitalproject.org/people.html#Verutes">Mapping portal by Gregg Verutes</a>');

	var BelizeBaseMap = L.mapbox.gridLayer('geointerest.BelizeBaseMap');
	map.addLayer(BelizeBaseMap);
	map.addControl(L.mapbox.gridControl(BelizeBaseMap));

	// build Belizelayers, grid layers, and grid controls
	// var BelizeLayers = {
    // Lobster_grid: L.mapbox.gridLayer('geointerest.BelizeLobster')
	// };
	// BelizeLayers.Lobster_gridControl = L.mapbox.gridControl(BelizeLayers.Lobster_grid);

	// var BelizeLobster = L.mapbox.gridLayer('geointerest.BelizeLobster');
	// map.addLayer(BelizeLobster);
	// map.addControl(L.mapbox.gridControl(BelizeLobster, {follow: true}));

	//var BelizeCP = L.mapbox.gridLayer('geointerest.BelizeCP');
	//map.addLayer(BelizeCP);
	//map.addControl(L.mapbox.gridControl(BelizeCP, {follow: true}));

  	var mapboxUrl='http://a.tiles.mapbox.com/v3/examples.map-9ijuk24y/{z}/{x}/{y}.png';
	var mb = new L.TileLayer(mapboxUrl, {minZoom: 0, maxZoom: 14});
	var miniMap = new L.Control.MiniMap(mb, { toggleDisplay: true }).addTo(map);

	layerControl = L.control.layers({
		'satellite': L.mapbox.tileLayer('geointerest.map-dqz2pa8r').addTo(map),
		'terrain': L.mapbox.tileLayer('examples.map-9ijuk24y'),
	}, {
		'Coastal Zone (<i>zoom level > 10 only</i>)': L.mapbox.tileLayer('geointerest.BelizeLandMap').addTo(map),
		'Habitats': L.mapbox.tileLayer('geointerest.BelizeHabitats').addTo(map),
		'Marine Recreation': L.mapbox.tileLayer('geointerest.BelizeMarineRec'),
		'Fishing Area': L.mapbox.tileLayer('geointerest.BelizeFishingArea'),
		'Agricultural Runoff': L.mapbox.tileLayer('geointerest.BelizeAgRunoff'),
		'Special Development Areas': L.mapbox.tileLayer('geointerest.BelizeSDA'),
		'Oil Exploration': L.mapbox.tileLayer('geointerest.BelizeOil'),
		'Marine Transportation': L.mapbox.tileLayer('geointerest.BelizeTransport'),
		'Dredging': L.mapbox.tileLayer('geointerest.BelizeDredge'),
		'Conservation': L.mapbox.tileLayer('geointerest.BelizeConservation'),
		'Aquaculture': L.mapbox.tileLayer('geointerest.BelizeAqua'),
		'Coastal Development': L.mapbox.tileLayer('geointerest.BelizeDevelopment'),
		'Cultural & Historic Areas<hr><b>InVEST Outputs:</b>': L.mapbox.tileLayer('geointerest.BelizeCHA'),
		'Risk to Habitats': L.mapbox.tileLayer('geointerest.BelizeHabitatsRisk'),
		'Recreation': L.mapbox.tileLayer('geointerest.BelizeRecreation'),
		'Spiny Lobster': L.mapbox.tileLayer('geointerest.BelizeLobster'),
		'Coastal Protection': L.mapbox.tileLayer('geointerest.BelizeCP'),
		'Coastal Hazard': L.mapbox.tileLayer('geointerest.BelizeCV'),
		'Towns / Planning Regions<hr><b>"Informed Management" Zones</b>': L.mapbox.tileLayer('geointerest.BelizeBaseMap').addTo(map),
	}, {position: 'topleft'}).addTo(map);

	map.on('layeradd', function(e) {
		if (e.layer.getTileJSON) {
		    map.legendControl.addLegend(e.layer.getTileJSON().legend);

            //JLC additions
            var layer_id = e.layer.getTileJSON().id;
            if (!gridControls[layer_id]){
                var grid = L.mapbox.gridLayer(layer_id);
                var gridControl = L.mapbox.gridControl(grid, {follow: true});

                gridControls[layer_id] = [grid, gridControl];
            }
            map.addLayer(gridControls[layer_id][0])
            map.addControl(gridControls[layer_id][1])
		}
	  });
	map.on('layerremove', function(e) {
		if (e.layer.getTileJSON) {
		    map.legendControl.removeLegend(e.layer.getTileJSON().legend);

            //JLC additions
            var layer_id = e.layer.getTileJSON().id;
            map.removeLayer(gridControls[layer_id][0])
            map.removeControl(gridControls[layer_id][1])
		}
	  });

	document.getElementById('map-ui').onclick = function(e) {
    var pos = e.target.getAttribute('data-position1');
    if (pos) {
        var loc = pos.split(',');
        map.setView(loc, 10);
    }
	var pos = e.target.getAttribute('data-position2');
    if (pos) {
        var loc = pos.split(',');
        map.setView(loc, 11);
    }
	var pos = e.target.getAttribute('data-position3');
    if (pos) {
        var loc = pos.split(',');
        map.setView(loc, 12);
    }
	var pos = e.target.getAttribute('data-position4');
    if (pos) {
        var loc = pos.split(',');
        map.setView(loc, 8);
    }
}

</script>