Selecting columns on a 3D Column Chart

HTML

<script type="text/javascript" src="http://www.amcharts.com/lib/3/amcharts.js"></script>
<script type="text/javascript" src="http://www.amcharts.com/lib/3/serial.js"></script>
<script type="text/javascript" src="http://www.amcharts.com/lib/3/themes/none.js"></script>
<div id="chartdiv"></div>

CSS

#chartdiv {
	width		: 100%;
	height		: 500px;
	font-size	: 11px;
}

JavaScript

var chart = AmCharts.makeChart("chartdiv", {
    "theme": "none",
    "type": "serial",
	"startDuration": 2,
    "dataProvider": [{
        "country": "USA",
        "visits": 4025,
        "color": "#FF0F00"
    }, {
        "country": "China",
        "visits": 1882,
        "color": "#FF6600"
    }, {
        "country": "Japan",
        "visits": 1809,
        "color": "#FF9E01"
    }, {
        "country": "Germany",
        "visits": 1322,
        "color": "#FCD202"
    }, {
        "country": "UK",
        "visits": 1122,
        "color": "#F8FF01"
    }, {
        "country": "France",
        "visits": 1114,
        "color": "#B0DE09"
    }, {
        "country": "India",
        "visits": 984,
        "color": "#04D215"
    }, {
        "country": "Spain",
        "visits": 711,
        "color": "#0D8ECF"
    }, {
        "country": "Netherlands",
        "visits": 665,
        "color": "#0D52D1"
    }, {
        "country": "Russia",
        "visits": 580,
        "color": "#2A0CD0"
    }, {
        "country": "South Korea",
        "visits": 443,
        "color": "#8A0CCF"
    }, {
        "country": "Canada",
        "visits": 441,
        "color": "#CD0D74"
    }, {
        "country": "Brazil",
        "visits": 395,
        "color": "#754DEB"
    }, {
        "country": "Italy",
        "visits": 386,
        "color": "#DDDDDD"
    }, {
        "country": "Australia",
        "visits": 384,
        "color": "#999999"
    }, {
        "country": "Taiwan",
        "visits": 338,
        "color": "#333333"
    }, {
        "country": "Poland",
        "visits": 328,
        "color": "#000000"
    }],
    "valueAxes": [{
        "position": "left",
        "title": "Visitors"
    }],
    "graphs": [{
        "balloonText": "[[category]]: <b>[[value]]</b>",
        "colorField": "color",
        "color": "color",
        "bold": "bold",
        "fillAlphas": 1,
        "fillColorsField": "fill",
        "lineAlpha": 0.1,
        "type": "column",
       ...