To reproduce this use the following code snippet:
<telerik:RadDiagram> <telerik:RadDiagramShape Content="Shape 1" Position="100, 100"/> <telerik:RadDiagramShape Content="Shape 2" UseGlidingConnector="True" Position="300, 100"/></telerik:RadDiagram>Steps to reproduce:
1. Start a new connection from Shape 1, by dragging one of its connectors.
2. Drag the connection over Shape 2.
Expected: The connector closest to the mouse should get highlighted and when you drop the connection it should get attached to the shape.
Actual: The closest connector is not highlighted. Also, when you drop the connection over the target shape it doesn't get attached.