GroupNode Deletable = False doesn't work

Hi, I have GroupNode on which I set the Go:Part.Deletable property to False, but I’m still capable to delete the group in the diagram. Do I miss something??

When you set Deletable to False on a group and then attempt to delete the group, the group isn’t deleted. However all the parts within the group are deleted (unless they too have their own Deletable property set to False).