Hi JVM,
Thanks for using Syncfusion products and sorry for the delay in getting back to you.
We suggest you to use InsertNodeTool to achieve your requirement. Here is the code snippet for your reference.
[C#]
Ellipse pt = new Ellipse(0, 0, 5, 5);
pt.FillStyle.Color = Color.Black;
//Activate insertnode tool with the point node
diagram1.Controller.NodeToInsert = pt;
diagram1.Controller.ActivateTool("InsertNodeTool");
Here is the sample which meets your requirement.
F100436-1668839153.zipPlease try this and let me know if this helps.
Note : The InsertNodeTool is available in the latest version.
Regards,
Pandi Murugan A