Hi Matthias,
Thanks for using Syncfusion Products.
We suggest to use “OptimizePiePointPositions” property of chart series to modify the pie slice order. It specifies if the data points with smaller values are grouped together and ordered. By default, they are ordered in the order in which the points are added to the series. Please refer below code snippet.
[C#]
<code>
series1.OptimizePiePointPositions = false;
</code>
For more information about OptimizePiePointPositions ,Please refer our online documentation link below.
http://help.syncfusion.com/UG/User%20Interface/ASP.NET/Chart/Documents/45149optimizepiepointpositions.htm
For your convenience, we have created sample and the same can be downloaded from the following link.
http://www.syncfusion.com/downloads/Support/DirectTrac/95875/F104129326799840.zip
Please let me know if you have any other questions or concerns.
Regards,
Siva