In other charts types bar, column, line, area etc you can set
a seperate dataprovider for the labels ( in CategoryAxis ) and the
data ( lineSeries, columnSeries, etc).... yet in the pieChart both
labels and data dataproviders are set in pieSeries and it only
accepts one dataProvider.
Is there any way to set the dataproviders seperately in
piecharts. Seems silly to allow this in other graph types but not