title: Change chart type with drilldown series
body: <p>I have an issue regarding with my drilldown charts..</p>
  
  <p>Here is the link: <a href="http://jsfiddle.net/lorwynz_11/sSLnn/3/" rel="nofollow">http://jsfiddle.net/sSLnn/3/</a></p>
  
  <pre><code>    chartfunc = function()
   {
  var column = document.getElementById('column');
  var bar = document.getElementById('bar');
  var pie = document.getElementById('pie');
  var line = document.getElementById('line');
  
  
  if(column.checked)
  {
  
      options.chart.renderTo = 'container';
      options.chart.type = 'column';
      var chart1 = new Highcharts.Chart(options);
  }
  else if(bar.checked)
  {
      options.chart.renderTo = 'container';
      options.chart.type = 'bar';
      var chart1 = new Highcharts.Chart(options);
  
  }
  else if(pie.checked)
  {
      options.chart.renderTo = 'container';
      options.chart.type = 'pie';
      var chart1 = new Highcharts.Chart(options);
  }
  else
  {
      options.chart.renderTo = 'container';
      options.chart.type = 'line';
      var chart1 = new Highcharts.Chart(options);
  }
  
  }
  </code></pre>
  
  <p>In my chart I can change its type successfully with 4 radio buttons, however when i am in drill down series state then change the type of chart it will load to the original series state.. Is it possible when i change the type of the chart if i am in drill down series state it will change the type and the data will still remains?</p>