Graphical error in BasicPieChart demo in ChartsSampler.jar

I run (doubleclick) ChartsSampler.jar and select the "BasicPieChart" demo. It looks like in
piechart1.png. Then I click "Add Data Item" which adds "item1" to the chart. But then there
are some graphical errors. Now there are two line that try to connect "Dell" with the pie chart,
but of those is wrong. Please have a look at piechart2.png.
Please also see these two little gray lines on the lower left side of the white background.