Hi Shaun,
Sorry for the inconvenience caused.
If your intention is to bring the Link label programatically to the edit mode, then you can use "ITextEditor" interface. Please refer the attached sample. Initially you should select the the link and when you click on the "Begin Edit Label" button you can bring the link label of the selected link to edit mode. Afer editing the label you should click on "End Edit Label" button. This will terminate the Edit mode.
Please give us more details regarding this issue or please modify this sample to your requirement, if the above information doesnot helps you.
Thank you for interesting in Syncfusion Essential Diagram.
Regards,
Nagaraj
EditLabels.zip