/* I know, this hierarchy looks a lot like the one of Gtk+, it is
 * normal, it is an imitation, because I know it well, and I find it
 * good, with some exceptions. */

Container		*
  Bin			*
    Window		*	TODO: border, shadow
      Menu
      Dialog
    Frame		*
    Button		*	TODO: themable border
      CheckButton	*
	RadioButton	*
      OptionMenu
    MenuItem
      CheckMenuItem
        RadioMenuItem
    Notebook
  Box			*
    HBox		*
    VBox		*
  Table
  List			*
    Tree
  Notebook
Label			*
Editable
  Entry			±
  Text
Range
  HRange
  VRange
MenuBar
Rule			*
