gimp/devel-docs/libgimp/libgimp.hierarchy

GtkObject
  GtkWidget
    GtkContainer
      GtkTable
        GimpChainButton
        GimpSizeEntry
      GtkBin
        GtkButton
          GimpColorButton
          GtkOptionMenu
            GimpUnitMenu
      GtkBox
        GtkHBox
          GimpFileSelection
        GtkVBox
          GimpPathEditor
    GtkMisc
      GtkPixmap
        GimpPixmap