0}
    ];

    var dataset = new vis.DataSet(items);
    var options = {
        start: '2014-06-10',
        end: '2014-06-18',
        dataAxis: {
            showMinorLabels: false,
            icons: true
        }
    };

    var groupData = {
        id: 0,
        content: "Group Name",
        options: {
            drawPoints: {
                style: 'square' // square, circle
            },
            shaded: {
                orientation: 'zero' // top, bottom
            }
        }
    };

  