The Hierarchical class provides the basic functionality for parent-child relationships (and changing these relationships) for both the WonderlandScene and any WonderlandActors in the Wonderland.

	parent-child
	allChildrenDo: getAllChildren getChildren getChildrenNames getParent setParent: withAllChildrenDo:

	private
	addChild: appearsInChildLists appendChildrenNamesTo: removeChild:

	initialization	top
	initialize Initialize this instance
	uniqueNameFrom: Return a unique name for the string in the context of the receiver's name space

	parent-child	top
	allChildrenDo: Execute aBlock for all children of the receiver
	getAllChildren Return all of this instance's children
	getChildren Return the object's children.
	getChildrenNames Return the object's children.
	getParent Return the object's parent.
	setParent: Set this instance's parent
	withAllChildrenDo: Execute aBlock for all children of and the receiver itself

	private	top
	addChild: Add an object to this instance's list of children
	appearsInChildLists Returns true if this object should appear in the actor browser
	appendChildrenNamesTo: Return the object's children's names, each appended to the prefix.
	removeChild: Remove an object from this instance's list of children

	instance creation	top
	new Create and initialize a new instance.