d3.demo.container = function() {

    "use strict";

    var shape           = d3.demo.shape(),
        children        = [],
        flowbox         = null;


    function container(selection) {
        shape.call(shape, selection);
        d3.select(shape.node).classed("container", true);
        flowbox = d3.demo.flowbox().shape(shape).x(5).y(30);
        d3.select(shape.node).call(flowbox);
        container.node = shape.node;
        container.render = function() {
            flowbox.children(children).render();
            setTimeout(shape.render, 250); // give flow time to run before rendering
        };

        container.render();
    }


    container.children = function(value) {
        if (!arguments.length) { return children; }
        children = value;
        return this;
    };


    return d3_shape_rebind(container, shape);
};