Here are the data structures with brief descriptions:

[detail level 123]

delegates
IDelegateMYGUI_SUFFIX
CStaticDelegateMYGUI_SUFFIX
CMethodDelegateMYGUI_SUFFIX
CDelegateMYGUI_SUFFIX
CMultiDelegateMYGUI_SUFFIX
MyGUI
action
delegates
IDelegateUnlink
IDelegate0
CStaticDelegate0
CMethodDelegate0
CDelegate0
CMultiDelegate0
IDelegate1
CStaticDelegate1
CMethodDelegate1
CDelegate1
CMultiDelegate1
IDelegate2
CStaticDelegate2
CMethodDelegate2
CDelegate2
CMultiDelegate2
IDelegate3
CStaticDelegate3
CMethodDelegate3
CDelegate3
CMultiDelegate3
IDelegate4
CStaticDelegate4
CMethodDelegate4
CDelegate4
CMultiDelegate4
IDelegate5
CStaticDelegate5
CMethodDelegate5
CDelegate5
CMultiDelegate5
IDelegate6
CStaticDelegate6
CMethodDelegate6
CDelegate6
CMultiDelegate6
FontCodeType
geometry_utility
texture_utility
types
TCoord
TPoint
TRect
TSize
utility
templates
xml
utility
ElementType
ErrorType
ElementEnumerator
Element
Document
Align
Allocator
rebind
Any
AnyEmpty
MemberObsolete< Button >
MemberObsolete< ComboBox >
MemberObsolete< EditBox >
MemberObsolete< ItemBox >
MemberObsolete< ListBox >
MemberObsolete< MenuControl >
MemberObsolete< MenuItem >
MemberObsolete< MultiListBox >
MemberObsolete< ProgressBar >
MemberObsolete< ScrollView >
MemberObsolete< TabControl >
MemberObsolete< Widget >
MemberObsolete< Window >
MemberObsolete< FontManager >
MemberObsolete< Gui >
MemberObsolete< InputManager >
MemberObsolete< LanguageManager >
MemberObsolete< LayerManager >
MemberObsolete< LayoutManager >
MemberObsolete< PluginManager >
MemberObsolete< PointerManager >
MemberObsolete< ResourceManager >
MemberObsolete< SkinManager >
MemberObsolete< WidgetManager >
BackwardCompatibility
BiIndexBase
Bitwise
Button	Button properties. Button_skin_childs Skin childs. Button widget description should be here
Canvas	Canvas properties. Canvas_skin_childs Skin childs. Widget wrapper over Texture - shows the texture. Implemented: resizing of texture (see TextureResizeMode); recovery after loosing device;
Event
ChildSkinInfo
ClipboardManager
Colour
ComboBox	ComboBox properties. ComboBox_skin_childs Skin childs. ComboBox widget description should be here
SubSkinStateInfo
TileRectStateInfo
RotatingSkinStateInfo
EditTextStateInfo
ConsoleLogListener
Constants
ControllerEdgeHide
ControllerFadeAlpha
ControllerItem
ControllerManager
ControllerPosition
CoordConverter
DataFileStream
DataManager
DataMemoryStream
DataStream
DataStreamHolder
DDContainer	DDContainer properties. DDContainer_skin_childs Skin childs. DDContainer widget description should be here
DDItemState
DDItemInfo
DDWidgetState
MemberObsolete
VScroll
HScroll
DynLib	Resource holding data about a dynamic library
DynLibManager	Manager of dynamic libraries
EditBox	EditBox properties. EditBox_skin_childs Skin childs. EditBox widget description should be here
EditText
Enumerator
EventPair
EventPairAddParameter
Exception
FactoryManager
FileLogListener
FlowDirection
GlyphInfo
FontManager
GenericFactory
Gui
IBDrawItemInfo
IBNotifyItemData
ICroppedRectangle
IDataStream
IFont
IItem
IItemContainer
ILayer
ILayerItem
ILayerNode
ILogFilter
ILogListener
ImageBox	ImageBox properties. ImageBox_skin_childs Skin childs. ImageBox widget description should be here
ImageItem
ImageIndexInfo
InputManager
IObject
IPointer
IRenderTarget
IResource
ISerializable
IStateInfo
ISubWidget
ISubWidgetRect
ISubWidgetText
ItemBox	ItemBox properties. ItemBox_skin_childs Skin childs. ItemBox widget description should be here
ItemDataInfo
ITextureInvalidateListener
ITexture
IUnlinkWidget
IVertexBuffer
KeyCode
LanguageManager
LayerItem
LayerManager
LayerNode
ControllerInfo
WidgetInfo
LayoutManager
LevelLogFilter
ListBox	ListBox properties. ListBox_skin_childs Skin childs. ListBox widget description should be here
LogLevel
LogManager
LogSource
LogStream
End
MainSkin
MaskPickInfo
MenuBar	MenuBar properties. MenuBar_skin_childs Skin childs. MenuBar widget description should be here
MenuControl	MenuControl properties. MenuControl_skin_childs Skin childs. MenuControl widget description should be here
ItemInfo
MenuItem	MenuItem properties. MenuItem_skin_childs Skin childs. MenuItem widget description should be here
MenuItemType
MouseButton
MultiListBox	MultiListBox properties. MultiListBox_skin_childs Skin childs. MultiListBox widget description should be here
MultiListItem	MultiListItem properties. MultiListItem_skin_childs Skin childs. MultiListItem widget description should be here
OverlappedLayer
IPlugin	Base plugin class
PluginManager	Plugin manager. Load/unload and register plugins
PointerManager
PolygonalSkin
PopupMenu	PopupMenu properties. PopupMenu_skin_childs Skin childs. PopupMenu widget description should be here
ProgressBar	ProgressBar properties. ProgressBar_skin_childs Skin childs. ProgressBar widget description should be here
VertexColourType
PixelFormat
TextureUsage
RenderItem
RenderManager
RenderTargetInfo
ResizingPolicy
ResourceImageSet
IndexImage
GroupImage
ResourceImageSetPointer
ResourceLayout
ResourceManager
ResourceManualFont
ResourceManualPointer
ResourceSkin
ResourceTrueTypeFont
RotatingSkin
ScrollBar	ScrollBar properties. ScrollBar_skin_childs Skin childs. ScrollBar widget description should be here
ScrollView	ScrollView properties. ScrollView_skin_childs Skin childs. ScrollView widget description should be here
ScrollViewBase
SharedLayer
SharedLayerNode
SimpleText
Singleton
SkinItem
SkinManager
SubSkin
SubWidgetBinding
SubWidgetInfo
SubWidgetManager
TabControl	TabControl properties. TabControl_skin_childs Skin childs. TabControl widget description should be here
TabItemInfo
TabItem	TabItem properties. TabItem_skin_childs Skin childs. TabItem widget description should be here
TextBox	TextBox properties. TextBox_skin_childs Skin childs. TextBox widget description should be here
TextCommandInfo
TextIterator
TextView
CharInfo
LineInfo
TileRect
Timer
ToolTipManager
UString	A UTF-16 string with implicit conversion to/from std::string and std::wstring
_base_iterator	Base iterator class for UString
_const_fwd_iterator	Const forward iterator for UString
_const_rev_iterator	Const reverse iterator for UString
_fwd_iterator	Forward iterator for UString
_rev_iterator	Forward iterator for UString
invalid_data	This exception is used when invalid data streams are encountered
Version
Vertex
VertexQuad
Widget	Widget properties. Widget_skin_childs Skin childs. Widget widget description should be here
WidgetInput
WidgetManager
WidgetStyle
ToolTipInfo
UserData
Window	Window properties. Window_skin_childs Skin childs. Window widget description should be here