Hi Christophe,
Thanks for using Syncfusion Products
Requirement: Disable Selection Zone in Diagram View
We have achieved your requirement “to disable the selection zone in the diagram view” by using ItemSelectionMode property of Diagram View. ItemSelectionMode property specifies the item selection mode for diagram view elements. The default value is Multiple. Please refer to the code snippet as below
Code Snippet:
diagramview.ItemSelectionMode = ItemSelectionMode. Single;
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Here diagramview is the instance of Diagram View.
Please refer to the following online help documentation link for more information about ItemSelectionMode
Link: http://help.syncfusion.com/ug/wpf/documents/itemselectionmode.htm
Please let us know if you require further assistance on this,
Regards,
Ranjitha A.