Hi Truman ,
Thanks for your interest in Syncfusion products.
When you set ConnectionPointType to "Incoming" of a port, that port should connect with the TailEndPoint of the connector. Similarly when a port's ConnectionPointType is set to OutGoing, that port should connect with the HeadEndPoint of the connector. Please refer to the attached sample, in which Port1(hosted on top rectangle) is set as Outgoing port and Port2(hosted on bottom rectangle) is set as incoming port. Here when you try to connect the connector from Port2 to Port1, the connection gets disconnected. Please refer to the attached video clip that shows this result.
Sample:
http://websamples.syncfusion.com/samples/Diagram.Windows/F74897/main.htmVideo:
http://www.syncfusion.com/Product/uploads/Video_89c6da1d.zipPlease let me know if this helps.
Regards,
Nagaraj