Hi Trinath,
Currently DiagramControl does not have inbuilt property grid support. However Syncfusion property grid can be used to achieve your requirement. When node or line is selected, NodeSelected or ConnectorSelected event will be fired, Property grid can be set with the selected object. We have created a sample based on the requirement please refer the sample from the attachment.
Regards,
Maria Amal Raj T,
Diagram WPF & Silverlight Team,
[Syncfusion].
PropertyGrid_84ca38db.zip