I am a Master Parts Bin that allows the user to drag out a new Morph from a voluminous iconic list.

Choose "objects" from the world menu, or type Alt-o (Cmd-o on the Mac).

To add a new kinds of Morphs:
In the class of the Morph, implement the message:

descriptionForPartsBin
^ self partName: 'Rectangle'
categories: #('Graphics' ' Basic 1 ')
documentation: 'A rectangular shape, with border and fill style'

The partName is the title that will show in the lower pane of the Object Tool.
When is categories mode, an object can be seen in more than one category. The list above tells which ones.
Documentation is what will show in the balloon help for each object thumbnail.
The message #initializeToStandAlone creates the actual instance.

To make a second variant object prototype coming from the same class, implement #supplementaryPartsDescriptions. In it, you get to specify the nativitySelector. It is sent to the class to get the variant objects. Often it is #authoringPrototype. (A class may supply supplementaryPartsDescriptions without implementing descriptionForPartsBin. This gives you better control.)

	categories
	showCategories showCategory:fromButton: tabsForCategories

	initialization
	initializeForFlap initializeToStandAlone tweakAppearanceAfterModeShift

	major modes
	modeSymbol modeSymbol: modeTabs

	menu
	addCustomMenuItems:hand: resetThumbnails

	miscellaneous
	setExtentFromHalo:

	search
	newSearchPane searchPane searchPaneCharacter: setSearchStringFromSearchPane showMorphsMatchingSearchString showSearchPane

	tabs
	initializeWithTabs: paneForTabs: prepareInitialAppearanceForTabs: presentHelp tabsPane

	alphabetic	top
	alphabeticTabs Answer a list of buttons which, when hit, will trigger the choice of a morphic category
	installQuads:fromButton: Install items in the bottom pane that correspond to the given set of quads, as triggered from the given button
	showAlphabeticCategory:fromButton: Blast items beginning with a given letter into my lower pane
	showAlphabeticTabs Switch to the mode of showing alphabetic tabs

	categories	top
	showCategories Set the receiver up so that it shows tabs for each of the standard categories
	showCategory:fromButton: Project items from the given category into my lower pane
	tabsForCategories Answer a list of buttons which, when hit, will trigger the choice of a category

	initialization	top
	initializeForFlap Initialize the receiver to operate in a flap at the top of the screen. This worked in the past, but is not currently in the released UI and is not likely to work without some fixup.
	initializeToStandAlone Initialize the receiver so that it can live as a stand-alone morph
	tweakAppearanceAfterModeShift After the receiver has been put into a given mode, make an initial selection of category, if appropriate, and try to overcome persistent and annoying layout problems associated with initial state. This method contains a mish-mash of measures, sometimes obviously desparate, some likely overkill, some no longer required. Pax!

	major modes	top
	modeSymbol Answer the modeSymbol
	modeSymbol: Set the receiver's modeSymbol as indicated
	modeTabs Answer a list of buttons which, when hit, will trigger the choice of mode of the receiver

	menu	top
	addCustomMenuItems:hand: Add items to the given halo-menu, given a hand
	resetThumbnails Reset the thumbnail cache

	miscellaneous	top
	setExtentFromHalo: The user has dragged the grow box such that the receiver's extent would be anExtent. Do what's needed

	search	top
	newSearchPane Answer a type-in pane for searches
	searchPane Answer the receiver's search pane, nil if none
	searchPaneCharacter: A character represented by the event handed in was typed in the search pane by the user
	setSearchStringFromSearchPane Set the search string by obtaining its contents from the search pane, and doing a certain amount of munging
	showMorphsMatchingSearchString Project items matching the search string into my lower pane
	showSearchPane Set the receiver up so that it shows the search pane

	tabs	top
	initializeWithTabs: Initialize the receiver to have the given tabs
	paneForTabs: Answer a pane bearing tabs for the given list
	prepareInitialAppearanceForTabs: Prepare the initial appearance for a list of tabs
	presentHelp Sent when a Help button is hit; provide the user with some form of help for the tool at hand
	tabsPane Answer the pane that holds the tabs

	parts bin	top
	descriptionForPartsBin If the receiver is a member of a class that would like to be represented in a parts bin, answer the name by which it should be known, and a documentation string to be provided, for example, as balloon help. When the 'nativitySelector' is sent to the 'globalReceiver', it is expected that some kind of Morph will result. The parameters used in the implementation below are for documentation purposes only!