	Name	Description
	Category	Gets or sets a `String` that names the category to which the node data belongs.
	ChildKeys	Gets or sets the list of keys identifying the "children" nodes.
	IsTreeExpanded	Gets or sets whether this node is in the "expanded" state.
	Key	Gets or sets the key property for this node data.
	Location	Gets or sets a `Point` that is the location of the node in model coordinates.
	ParentKey	Gets or sets the key property referring to the "parent" node, if any.
	Text	Gets or sets a `String` that is associated with the node.
	WasTreeExpanded	Gets or sets whether this node had been "expanded" when its parent node was "collapsed".

	Name	Description
	ChangeDataValue	This method implements the IChangeDataValue interface, used to perform state changes for undo and redo.
	Clone	Create a copy of this data; this implements the `ICloneable` interface.
	LoadFromXElement	Initialize this node data with data held in a Linq for XML `XElement`.
	MakeXElement	Constructs a Linq for XML `XElement` holding the data of this node.
	OnPropertyChanged	Raise the PropertyChanged event.
	ToString	For debugging, use the Key property as this object's default text rendering.

	Name	Description
	ConvertNodeKeyToString	Convert a NodeKey key value to a string.
	ConvertStringToNodeKey	Convert a string to a NodeKey key value.
	RaisePropertyChanged	Call this method from property setters to raise the PropertyChanged event.