D3 Zoomable Treemap Resize - javascript

I'm having some issues trying to make my treemap resizable on window resize:
I started from this example:
https://secure.polisci.ohio-state.edu/faq/d3/zoomabletreemap_code.php
This is my resize() function, I do nothing more than remove the graph, redefine div#graph width and height and rerun the init code you can see in the link above. (drawGraph() do the d3 treemap work and json is a global var containing the data):
function resize(){
d3.select("#graph svg")
.remove();
margin = {top: 50, right: 0, bottom: 0, left: 0},
width = $('#graph').innerWidth(),
height = $('#graph').height() - margin.top - margin.bottom
x = d3.scale.linear()
.domain([0, width])
.range([0, width]);
y = d3.scale.linear()
.domain([0, height])
.range([0, height]);
treemap = d3.layout.treemap()
.children(function(d, depth) { return depth ? null : d._children; })
.sort(function(a, b) { return a.value - b.value; })
.ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
.round(false)
.value(function(d) { return d.size; })
svg = d3.select("#graph").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.bottom + margin.top)
.style("margin-left", -margin.left + "px")
.style("margin.right", -margin.right + "px")
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.style("shape-rendering", "crispEdges");
grandparent = svg.append("g")
.attr("class", "grandparent");
grandparent.append("rect")
.attr("y", -margin.top)
.attr("width", width)
.attr("height", margin.top)
grandparent.append("text")
.attr("x", 6)
.attr("y", 6 - margin.top)
.attr("dy", "30px")
drawGraph(json)
}
Here the problem: the graph is redrawn correctly, but without any children! My treemap have height 3, after the resize it's like all the nodes become leafs.
SOLUTION
I edited the accumulate function:
function accumulate(d) {
if (d._children === undefined) {
return (d._children = d.children)
? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
: d.value;
} else {
return d.value;
}
}
And on window resize event I update width and height of the svg element and re-execute:
initialize(), accumulate(), layout(), display()

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In ready do this:
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A fresh new look at it and I managed to find the solution. I removed the tag bars in this line:
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