code: function (vis) {
  		var point = this,
  			chart = point.series.chart,
  			tracker = point.tracker,
  			dataLabel = point.dataLabel,
  			connector = point.connector,
  			shadowGroup = point.shadowGroup,
  			method;
  
  		// if called without an argument, toggle visibility
  		point.visible = vis = vis === UNDEFINED ? !point.visible : vis;
  
  		method = vis ? 'show' : 'hide';
  
  		point.group[method]();
  		if (tracker) {
  			tracker[method]();
  		}
  		if (dataLabel) {
  			dataLabel[method]();
  		}
  		if (connector) {
  			connector[method]();
  		}
  		if (shadowGroup) {
  			shadowGroup[method]();
  		}
  		if (point.legendItem) {
  			chart.legend.colorizeItem(point, vis);
  		}
  	}
docs: Toggle the visibility of the pie slice
  @param {Boolean} vis Whether to show the slice or not. If undefined, the
  visibility is toggled