DependencyRelationship
Describes the relationship an IDependencyTreeNode has with its Parent.
Child = 1
The object(s) represented by the IDependencyTreeNode are children of the object(s) to be deleted.
Field = 2
The object(s) represented by the IDependencyTreeNode are used in the value of an object field.
Parent = 0
The IDependencyTreeNode is at the root of the dependency tree.