angularjs - Highchart-ng change the chart type in drilldown -

i need change chart type after 1 level of drill down, drill down level must remain same.

i looking similar

http://jsfiddle.net/vealz/ highcharts-ng.

specifically part emulates:

  $("#container").highcharts().series[0].update({ type: 'column' }); 

so far have been successful @ creating multi level drill down. each time try change chart type, drill-down resets