| UAlertbox | Alertbox gadget |
| UAlpha | Alpha blending property |
| UAppli | Application Context |
| UArgs | UArgs: list of arguments that is passed to UGroups and subclasses |
| UArgsImpl | UArgsImpl: implementation of UArgs (should not be used directly by clients) |
| UBackground | Background property |
| UBar | UBar = horizontal Bar (for making toolbars) |
| UBgcolor | Active Background Color Property |
| UBorder | Border decoration Property |
| UBox | Graphical "viewable" container |
| UBrick | Ubit Brick: base class for objects that can be added to the instance graph (abstract class) |
| UButton | Button gadget |
| UCheckbox | Checkbox gadget |
| UChoice | Exclusive selector for making UListbox |
| UColor | Active Color Property |
| UCombobox | Combo box gadget |
| UCond | Base class for Ubit conditions |
| UConf | Configuration of the UAppli |
| UCursor | Mouse cursor |
| UDialog | UDialog: dialog box |
| UDisp | Display Context |
| UEdit | Make a Container object editable |
| UElem | Base class for Viewable Objects |
| UElemProps | Useful information on UElem objects that are retrieved by UEvent::getElem() |
| UEvent | Ubit Event class |
| UFilestat | File status returned by functions that open files |
| UFlag | Flagging conditions |
| UFlagdef | Flag Definition property |
| UFlatbutton | Flat Button gadget |
| UFloat | Active Float |
| UFloatBase | Float Base Class |
| UFlow | Event Flow [Ubit Internals] |
| UFlowbox | UFlowbox = Box with a Flow Layout (similar to an HTML page) |
| UFont | Active Font Property |
| UFontDesc | [impl] Internal representation for fonts |
| UFontFamily | Font Family object |
| UFrame | UFrame: main frame and primary main window |
| UGenCallImpl | UCall and its template subclasses define a family of classes for adding callback functions and methods to other bricks |
| UGraph | Client class for drawing graphics |
| UGroup | Logical "grouping" container |
| UHalign | Horizontal Alignment property |
| UHbox | UHbox = horizontal Box |
| UHeight | Height property |
| UHmargin | Horizontal Margin property |
| UHspacing | Horizontal Spacing property |
| UIma | Image Object |
| UIncrust | Incrusted Window |
| UInput | UInput object activates callbacks when a file or a socket gets data |
| UIntg | Active Integer |
| UIntgBase | Integer Base Class |
| UItem | Active Item gadget |
| ULabel | Label gadget |
| ULinkbutton | Link Button gadget |
| UListbox | List gadget |
| UListPos | Position in the child list |
| UMargins | Box margins |
| UMenu | UMenu: pulldown or cascaded menu |
| UMenubar | Menu bar |
| UMode | Objects' modes |
| UMSprotocol | Ubit Protocol for the UMS (Ubit Mouse/Message Server) |
| UMSrequest | UMS Request (from a Client to the UMS server) |
| UNatGraph | ATTENTION: les NatGraph sont PARTAGES! |
| UNatIma | Native image (encapsulates the corresponding X resources) |
| UOn | Event conditions |
| UOption | Command line options of the UAppli |
| UOrient | Orientation property |
| UPane | Pane gadget (for making Viewports, Cardboxes, Transparent layers) |
| UPaneView | Pane View Renderer |
| UPix | Pixmap Image object |
| UPlacement | Constrainst for automatic Window Placement |
| UPopmenu | UPopmenu: Contextual Menu |
| UPos | Position property |
| UProp | Base class for Graphical Properties |
| URadiobutton | Radio Button gadget |
| URadioSelect | Exclusive selector for selecting boxes (eg |
| URegion | Rectangular Region |
| UScale | Scale property |
| UScrollbar | Scrollbar gadget |
| UScrollbarView | Scrollbar View Renderer |
| UScrollpane | UScrollpane = UPane with scrollbars |
| USepar | Separator gadget |
| USourceProps | Event Properties of the Source & Source View |
| USpinbox | Spinbox gadget |
| USrange | Scaling conditions (for semantic zooming) |
| UStr | Active String class |
| UStyle | Box Style |
| USymbol | Active Symbol Class |
| UTable | UTable = class for creating (simplified) HTML like tables |
| UTableView | TableView Renderer see also: UTable |
| UTcell | Table Cell |
| UTextbox | Textbox gadget: base class for handling text |
| UTextfield | Text field gadget: single line editor |
| UTimer | UTimer object activates callbacks when a timeout is reached (or when the main loop become idle) |
| UTrow | Table Row |
| UUpdate | How to update UGroup, UBox, UWin objects and subclasses |
| UValign | Vertical Alignment property |
| UVbox | UVbox = vertical Box |
| UView | Box View |
| UViewStyle | Specifies the View Style of an UBox |
| UVmargin | Vertical Margin property |
| UVspacing | Vertical Spacing property |
| UWidth | Width property |
| UWin | Generic Window: base class for windows and menus |
| UWinGraph | Internal Graphics context for drawing Ubit objects |
1.4.2