Hi Robert, I aggree that this will be a nice feature of the PropertyGrid. Thank you also for sharing the additional scenario which a future implementation should also handle.
This is really needed. Particularly if radio buttons are used for some properties as per the documentation for custom items at https://docs.telerik.com/devtools/winforms/propertygrid/custom-items
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+1
+1
This gives great flexible to adding expandable objects to the propertygrid