This inheritance list is sorted roughly, but not completely, alphabetically:

[detail level 123]

CUIArea	Area consisting of left, top, right, and bottom value
▼CUIParent	Simple abstraction of elements which have at least one child
CUIDisplay	Representation of the display onto which UiUiUi renders its user interface
CUIEnvelope	Envelope widget which contains exactly one other widget and changes its representation
▼CUIWidgetGroup	Main abstraction of a group of interface widgets
CUICards	Widget group which shows nothing or exactly one of its sub-widgets
CUIColumns	Widget group for widgets organized in columns one next to the other
CUIRows	Widget group for widgets organized in rows one below the other
CUIPoint	Representation of a point on the display
CUISize	Representation of a size, i.e
▼CUIWidget	Basic widget class, ancestor of all UI widgets
CUIBitmap	A widget containing a bitmap (XBMP) which is set statically during compile time
CUICheckerboard	A widget drawing a checkerboard into its space
CUIEnvelope	Envelope widget which contains exactly one other widget and changes its representation
CUIHorizontalLine	Horizontal line with optional empty border on top and bottom, always spreads as wide as possible to the left and right
▼CUITextLine	A widget containing a line of text which is set dynamically during runtime using setText()
CUITextIcon	Widget which shows an icon by some normal text operation, usually with a font with icons
CUIVerticalLine	Vertical line with optional empty border left and right, always spreads as wide as possible to top and bottom
CUIWidgetGroup	Main abstraction of a group of interface widgets