Windows

addAttributeEditorNodeHelp 
colorEditor
confirmDialog
createEditor
defaultNavigation
editor
editorTemplate
fontDialog
layoutDialog
minimizeApp
progressWindow
promptDialog
refreshAE 
resetAE 
scriptEditorInfo
showSelectionInTitle
showWindow
toggleWindowVisibility
updateAE 
window
windowPref

Panels

componentEditor
getMayaPanelTypes 
getPanel
hardwareRenderPanel
hyperGraph
hyperPanel
hyperShade
modelEditor
modelPanel
newPanelItems
nodeOutliner
outlinerEditor
outlinerPanel
panel
panelConfiguration
panelHistory
scriptedPanel
scriptedPanelType
setEditor
setFocus
spreadSheetEditor
viewManip
visor
webBrowser
webBrowserPrefs

Controls

Buttons, Sliders, etc.
attrColorSliderGrp
attrControlGrp
attrFieldGrp
attrFieldSliderGrp
attrNavigationControlGrp
button
canvas
channelBox
checkBox
checkBoxGrp
cmdScrollFieldExecuter
cmdScrollFieldReporter
cmdShell
colorIndexSliderGrp
colorSliderButtonGrp
colorSliderGrp
commandLine
control
floatField
floatFieldGrp
floatScrollBar
floatSlider
floatSlider2
floatSliderButtonGrp
floatSliderGrp
gradientControl
gradientControlNoAttr
helpLine
hudButton
hudSlider
hudSliderButton
iconTextButton
iconTextCheckBox
iconTextRadioButton
iconTextRadioCollection
iconTextScrollList
iconTextStaticLabel
image
intField
intFieldGrp
intScrollBar
intSlider
intSliderGrp
layerButton
messageLine
nameField
palettePort
picture
progressBar
radioButton
radioButtonGrp
radioCollection
rangeControl
scriptTable
scrollField
separator
shelfButton
shellField
soundControl
swatchDisplayPort
switchTable
symbolButton
symbolCheckBox
text
textField
textFieldButtonGrp
textFieldGrp
textScrollList
timeControl
timePort
toolButton
toolCollection
treeView

Layouts

Organizing UI Components
columnLayout
formLayout
frameLayout
gridLayout
layout
menuBarLayout
paneLayout
rowColumnLayout
rowLayout
scrollLayout
shelfLayout
shelfTabLayout
tabLayout

Menus

artBuildPaintMenu
attrEnumOptionMenu
attrEnumOptionMenuGrp
attributeMenu
findMenuItem 
hotBox
listMenuAnnotation 
menu
menuEditor
menuItem
menuItemToShelf 
menuSet
menuSetPref
optionMenu
optionMenuGrp
popupMenu
radioMenuItemCollection
saveMenu

Misc. UI

Miscellaneous UI
addNewShelfTab 
addPanelCategory 
annotate
autoPlace
buttonManip
CBG 
createNewShelf 
deleteShelfTab 
grabColor
headsUpDisplay
headsUpMessage
hotkey
hotkeyCheck
isValidUiName 
linearPrecision
listPanelCategories 
loadNewShelf 
loadPrefObjects
nameCommand
overrideModifier
removePanelCategory 
runTimeCommand
saveAllShelves
savePrefObjects
savePrefs
saveShelf
scmh
scriptToShelf 
setMenuMode
setNodeTypeFlag
setStartupMessage
textManip
textToShelf 
validateShelfName