Hi Ronny,
We are able to customize the ConnectionPort shape by using
the PortShape property of the ConnectionPort. However, we have three predefined
shapes for Connection Port.
For more information, please refer our online documentation
using the below link.
Documentation Link: http://help.syncfusion.com/ug/wpf/diagram/default.htm#!documents/portshape.htm
And also, we have sample in Dahsboard to customise the
ConnectionPort. Please refer the ConnectionPortDemo in the below path.
Path : Dashboard àWPFàDiagramàGettingStartedàConnectionPortDemo
Please let us know if you have any concerns on this.
Regards,
Sudhakar C