Testing Column/Line overlap

behindColumns (http://docs.amcharts.com/3/javascriptcharts/AmGraph#behindColumns) only seems to affect lines that are after columns, lines before are always below.

by Anton

HTML

<script src="https://www.amcharts.com/lib/3/amcharts.js"></script>
<script src="https://www.amcharts.com/lib/3/serial.js"></script>
<script src="https://www.amcharts.com/lib/3/themes/light.js"></script>
<div id="chartdiv"></div>

CSS

#chartdiv {
	width		: 100%;
	height		: 400px;
	font-size	: 11px;
}

JavaScript

var chart = AmCharts.makeChart("chartdiv", {
  "type": "serial",
  
  "dataProvider": [{
    "year": 2011,
    "income": 30.1,
    "expenses": 34.9
  }, {
    "year": 2012,
    "income": 29.5,
    "expenses": 31.1
  }, {
    "year": 2013,
    "income": 30.6,
    "expenses": 28.2,
  }, {
    "year": 2014,
    "income": 34.1,
    "expenses": 32.9,
    "dashLengthColumn": 5,
    "alpha": 0.2,
    "additional": "(projection)"
  }],
  "valueAxes": [{
    "axisAlpha": 0,
    "position": "left"
  }],
  "graphs": [{
  	"title": "Income column",
    "fillAlphas": 1,
    "type": "column",
    "valueField": "income",
  }, {
  	"title": "Income line",
    "bullet": "round",
    "lineThickness": 3,
    "bulletSize": 7,
    "bulletBorderAlpha": 1,
    "bulletColor": "#FFFFFF",
    "useLineColorForBulletBorder": true,
    "bulletBorderThickness": 3,
    "fillAlphas": 0,
    "lineAlpha": 1,
    "valueField": "income"
  }, {
  	"title": "Expenses column",
    "fillAlphas": 1,
    "type": "column",
    "valueField": "expenses",
  }, {
  	"title": "Expenses line",
    "bullet": "round",
    "lineThickness": 3,
    "bulletSize": 7,
    "bulletBorderAlpha": 1,
    "bulletColor": "#FFFFFF",
    "useLineColorForBulletBorder": true,
    "bulletBorderThickness": 3,
    "fillAlphas": 0,
    "lineAlpha": 1,
    "valueField": "expenses"
  }],
  "categoryField": "year",
  "categoryAxis": {
    "gridPosition": "start",
    "axisAlpha": 0,
    "tickLength": 0
  },
  "legend": {
  	"enabled": true,
  	"position": "bottom"
  }
});