MorphExtension provides access to extra instance state that is not required in most simple morphs. This allows simple morphs to remain relatively lightweight while still admitting more complex structures as necessary. The otherProperties field takes this policy to the extreme of allowing any number of additional named attributes, albeit at a certain cost in speed and space.

	initialization
	initialize

	layout properties
	layoutFrame layoutFrame: layoutPolicy layoutPolicy: layoutProperties layoutProperties:

	named access
	actorState actorState: balloonText balloonText: balloonTextSelector balloonTextSelector: eventHandler eventHandler: externalName externalName: isPartsDonor isPartsDonor: locked locked: player player: sticky sticky: visible visible:

	object fileIn
	comeFullyUpOnReload: convertProperty:toValue:

	other
	isDefault printOn: removeOtherProperties sortedPropertyNames

	other properties
	hasProperty: otherProperties removeProperty: setProperty:toValue: valueOfProperty: valueOfProperty:ifAbsent: valueOfProperty:ifAbsentPut:

	copying	top
	copyWeakly list of names of properties whose values should be weak-copied when veryDeepCopying a morph. See DeepCopier.
	updateReferencesUsing: Update intra-morph references within a composite morph that has been copied. For example, if a button refers to morph X in the orginal composite then the copy of that button in the new composite should refer to the copy of X in new composite, not the original X. This default implementation updates the contents of any morph-bearing slot.
	veryDeepFixupWith: If target and arguments fields were weakly copied, fix them here. If they were in the tree being copied, fix them up, otherwise point to the originals!!
	veryDeepInner: Copy all of my instance variables. Some need to be not copied at all, but shared. This is special code for the dictionary. See DeepCopier.

	initialization	top
	initialize Init all booleans to default values

	layout properties	top
	layoutFrame
	layoutFrame:
	layoutPolicy
	layoutPolicy:
	layoutProperties
	layoutProperties: Return the current layout properties associated with the receiver

	named access	top
	actorState
	actorState:
	balloonText
	balloonText:
	balloonTextSelector
	balloonTextSelector:
	eventHandler
	eventHandler:
	externalName Answer an external name by which the receiver is known. Generic implementation here is a transitional backstop. probably
	externalName:
	isPartsDonor
	isPartsDonor:
	locked
	locked:
	player
	player:
	sticky
	sticky:
	visible
	visible:

	object fileIn	top
	comeFullyUpOnReload: inst vars have default booplean values.
	convertProperty:toValue: These special cases move old properties into named fields of the extension

	other	top
	isDefault Return true if the receiver is a default and can be omitted
	printOn: Append to the argument, aStream, a sequence of characters that identifies the receiver.
	removeOtherProperties Remove the 'other' properties
	sortedPropertyNames

	other properties	top
	hasProperty: Answer whether the receiver has the given property. Deemed to have it only if I have a property dictionary entry for it and that entry is neither nil nor false
	otherProperties
	removeProperty:
	setProperty:toValue: These special cases move old properties into named fields of the extension
	valueOfProperty:
	valueOfProperty:ifAbsent:
	valueOfProperty:ifAbsentPut: If the receiver possesses a property of the given name, answer its value. If not, then create a property of the given name, give it the value obtained by evaluating aBlock, then answer that value