I represent an item in a menu.

Instance variables:
isEnabled <Boolean> True if the menu item can be executed.
subMenu <MenuMorph | nil> The submenu to activate automatically when the user mouses over the item.
isSelected <Boolean> True if the item is currently selected.
target <Object> The target of the associated action.
selector <Symbol> The associated action.
arguments <Array> The arguments for the associated action.

	copying
	veryDeepFixupWith: veryDeepInner:

	drawing
	drawOn:

	events
	activateOwnerMenu: activateSubmenu: deselectTimeOut: doButtonAction handleMouseUp: handlesMouseDown: handlesMouseOver: handlesMouseOverDragging: invokeWithEvent: mouseDown: mouseEnter: mouseEnterDragging: mouseLeave: mouseLeaveDragging: mouseUp:

	grabbing
	aboutToBeGrabbedBy: duplicateMorph:

	initialization
	deleteIfPopUp: initialize

	layout
	minHeight minWidth

	layout-properties
	hResizing vResizing

	meta actions
	wantsHaloFromClick

	object fileIn

	private
	notObsolete offImage onImage

	selecting
	deselect: isSelected: select:

	accessing	top
	adaptToWorld: The receiver finds itself operating in a possibly-different new world. If any of the receiver's parts are world-dependent (such as a target of a SimpleButtonMorph, etc.), then have them adapt accordingly
	allWordingsNotInSubMenu: Answer a collection of the wordings of all items and subitems, but omit the stay-up item, and also any items in a submenu whose tag is given by verbotenSubmenuContents
	arguments
	arguments:
	contentString
	contentString:
	contents:
	contents:withMarkers:
	contents:withMarkers:inverse: Set the menu item entry. If aBool is true, parse aString for embedded markers.
	hasSubMenu Return true if the receiver has a submenu
	hasSubMenu:
	isEnabled
	isEnabled:
	isStayUpItem
	itemWithWording: If any of the receiver's items or submenu items have the given wording (case-blind comparison done), then return it, else return nil.
	selector
	selector:
	subMenu
	subMenu:
	target
	target:

	copying	top
	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. Warning!! Every instance variable defined in this class must be handled. We must also implement veryDeepFixupWith:. See DeepCopier class comment.

	drawing	top
	drawOn:

	events	top
	activateOwnerMenu: Activate our owner menu; e.g., pass control to it
	activateSubmenu: Activate our submenu; e.g., pass control to it
	deselectTimeOut: Deselect timout. Now really deselect
	doButtonAction Called programattically, this should trigger the action for which the receiver is programmed
	handleMouseUp: The handling of control between menu item requires them to act on mouse up even if not the current focus. This is different from the default behavior which really only wants to handle mouse ups when they got mouse downs before
	handlesMouseDown: Do I want to receive mouseDown events (mouseDown:, mouseMove:, mouseUp:)?
	handlesMouseOver: Do I want to receive mouseEnter: and mouseLeave: when the button is up and the hand is empty? The default response is false, except if you have added sensitivity to mouseEnter: or mouseLeave:, using the on:send:to: mechanism.
	handlesMouseOverDragging: Return true if I want to receive mouseEnterDragging: and mouseLeaveDragging: when the hand drags something over me (button up or button down), or when the mouse button is down but there is no mouseDown recipient. The default response is false, except if you have added sensitivity to mouseEnterLaden: or mouseLeaveLaden:, using the on:send:to: mechanism.
	invokeWithEvent: Perform the action associated with the given menu item.
	mouseDown: Handle a mouse down event. Menu items get activated when the mouse is over them.
	mouseEnter: Handle a mouseEnter event, meaning the mouse just entered my bounds with no button pressed. The default response is to let my eventHandler, if any, handle it.
	mouseEnterDragging: The mouse entered the receiver. Do nothing if we're not in a 'valid menu transition', meaning that the current hand focus must be aimed at the owning menu.
	mouseLeave: The mouse has left the interior of the receiver...
	mouseLeaveDragging: The mouse left the receiver. Do nothing if we're not in a 'valid menu transition', meaning that the current hand focus must be aimed at the owning menu.
	mouseUp: Handle a mouse up event. Menu items get activated when the mouse is over them. Do nothing if we're not in a 'valid menu transition', meaning that the current hand focus must be aimed at the owning menu.

	grabbing	top
	aboutToBeGrabbedBy: Don't allow the receiver to act outside a Menu
	duplicateMorph: Make and return a duplicate of the receiver's argument

	initialization	top
	deleteIfPopUp: Recurse up for nested pop ups
	initialize

	layout	top
	minHeight
	minWidth

	layout-properties	top
	hResizing Default to #spaceFill
	vResizing Default to #shrinkWrap

	meta actions	top
	wantsHaloFromClick Only if I'm not a lonely submenu

object fileIn

top

	private	top
	notObsolete Provide backward compatibility with messages being sent to the Hand. Remove this when no projects made prior to 2.9 are likely to be used. If this method is removed early, the worst that can happen is a notifier when invoking an item in an obsolete menu.
	offImage Return the form to be used for indicating an '<off>' marker
	onImage Return the form to be used for indicating an '<off>' marker

	selecting	top
	deselect:
	isSelected:
	select:

	class initialization	top
	additionsToViewerCategories Answer a list of (<categoryName> <list of category specs>) pairs that characterize the phrases this kind of morph wishes to add to various Viewer categories.
	initialize MenuItemMorph initialize