Iterator iterator= this.getIAxisPlotDataSetIterator();
while( iterator.hasNext() )
{
iAxisPlotDataSet= (IAxisPlotDataSet) iterator.next();
iAxisPlotDataSet.validate();
if( iAxisPlotDataSet.getNumberOfDataItems() != this.sizeOfEachDataSet )
{
throw new ChartDataException( "All IAxisPlotDataSet implementations must contain an equal number of elements in a Combo Chart" );
}