The objects are grouped into several sections according to the object class hierarchy within which they are defined. Each class below is indentified by its literal name. Just as with standard Tk widgets, you use the literal name as the Tcl command to create the widget: "< WidgetClass > < Tk pathname >". Also just like standard Tk widgets, widget attributes can be specified when the widget is initially created or later using the configure operation. Each link in this section points to a usage document for the object which details the method interface.