Here are the classes, structs, unions and interfaces with brief descriptions:

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