Disable-Click on Legend in HighCharts Column Graph

I am simply trying to disable the DRILL-DOWN effect on my 'Column Chart'. Can anyone help? Here is the sample code at Fiddle http://jsfiddle.net/D8Ez3/

*as you can see, the graph's legend is clickable. I need the items in the legend to not be clickable because when you click all items, the chart returns empty. I rather not have any drill-down for the chart. Any ideas?

chart = new Highcharts.Chart({
    chart: {
        renderTo: 'impact',
        type: 'column',
        margin: [0, 0, 0, 0],
        spacingTop: 0,
        spacingBottom: 0,
        spacingLeft: 0,
        spacingRight: 0,
        backgroundColor: null,
        events: {
            load: function (event) {
                console.log(this);
            }}},
    exporting: {
       buttons: { 
       exportButton: {
       enabled:false
    },
    printButton: {
        enabled:false
    }}},
credits: {
        enabled: false
    },
    title: {
        text: ''
    },
    subtitle: {
        text: ''
    },
    xAxis: {
        categories: ['Reporting Year']
    },
    yAxis: {
        min: 0,
        title: {
            text: 'Millions (mm)'
        }
    },
    legend: {
    enabled:false,
        layout: 'vertical',
        backgroundColor: '#FFFFFF',
        align: 'left',
        verticalAlign: 'top',
        x: 50,
        y: 30,
        floating: true,
        shadow: true
    },
    tooltip: {
        formatter: function () {
            return '' + this.x + ': ' + this.y + ' mm';
        }
    },
    plotOptions: {
        column: {
            pointPadding: 0.2,
            size: '95%',
            borderWidth: 0},
    point: {
                events: {
                    legendItemClick: function () {
                        return true; // <== returning false will cancel the
                        default action }}},
            allowPointSelect: false,
    },
    series: [{
        name: 'Yr 1',
        data: [23.7] }, 
    {
        name: 'Yr 2',
        data: [13.6] }, 
    {
        name: 'Yr 3',
        data: [49.9] }, 
    {
        name: 'Yr 4',
        data: [83.6] }]
      });

You were close. Instead of:

plotOptions: {
    column: {
        pointPadding: 0.2,
        size: '95%',
        borderWidth: 0
    },
    point: {
            events: {
                legendItemClick: function () {
                    return false; // <== returning false will cancel the default action
                }
            }
    },
    allowPointSelect: false,
},

You want:

plotOptions: {
    column: {
        pointPadding: 0.2,
        size: '95%',
        borderWidth: 0,
        events: {
            legendItemClick: function () {
                return false; 
            }
        }
    },
    allowPointSelect: false,
},