var allow_drag = function (div) {

    var board = tnt.board().from(20).to(500).width(950);

    // Axis track
    var axis_track = tnt.board.track()
        .height(0)
        .color("white")
        .display(tnt.board.track.feature.axis()
             .orientation("top")
        );

    // Data track
    var pin_track = tnt.board.track()
        .height(60)
        .color("white")
        .display(tnt.board.track.feature.pin()
            .index(function (d) {
                return d.pos;
            })
            .domain([0.3, 1.2])
            .color("red")
        )
        .data(tnt.board.track.data.sync()
            .retriever (function () {
                return [
                    {
                        pos : 200,
                        val : 0.5,
                        label : "1"
                    },
                    {
                        pos : 355,
                        val : 0.8,
                        label : "2"
                    },
                    {
                        pos : 100,
                        val : 0.3,
                        label : "3"
                    },
                    {
                        pos : 400,
                        val : 1,
                        label : "4"
                    }
                ];
            })
        );


    board
        .add_track([axis_track, pin_track]);

    board(div);

    var opt1 = d3.select(div)
        .append("span")
        .style("margin", "10px");
    opt1
        .append("input")
        .attr("type", "radio")
        .attr("name", "drag")
        .attr("value", 1)
        .attr("checked", 1)
        .on("change", function () {
            board.allow_drag(true);
        });
    opt1
        .append("text")
        .text("Allow drag");

    var opt2 = d3.select(div)
        .append("span")
        .style("margin", "10px");
    opt2
        .append("input")
        .attr("type", "radio")
        .attr("name", "drag")
        .attr("value", 0)
        .on("change", function () {
            board.allow_drag(false);
        });

    opt2
        .append("text")
        .text("Disallow drag");


    board.start();
};