GObject
        EActivity
            EComposerActivity
        EComposerHeader
            EComposerFromHeader
            EComposerNameHeader
            EComposerTextHeader
                EComposerPostHeader
                EComposerSpellHeader
        GInitiallyUnowned
            GtkWidget
                GtkContainer
                    GtkTable
                        EComposerHeaderTable
                    GtkBin
                        GtkWindow
                            GtkhtmlEditor
                                EMsgComposer