Gets whether dragged items can be dropped onto the chart.
If you set this property to true, the chart accepts all data formats, and assumes that the dragged data matches the format of the data in the data provider. To explicitly check the data format of the data being dragged, you must handle one or more of the drag events, such as dragOver, and call the preventDefault() method of the DragEvent to customize the way the list class accepts dropped data. When dropEnabled is set to true, Flex automatically calls the showDropFeedback() and hideDropFeedback() methods to display the drop indicator. The default value is false.