|  |  |  |  | 
    GObject
    ├── EComposerHeader
    │   ├── EComposerFromHeader
    │   ├── EComposerNameHeader
    │   ╰── EComposerTextHeader
    │       ├── EComposerPostHeader
    │       ╰── EComposerSpellHeader
    ╰── GInitiallyUnowned
        ╰── GtkWidget
            ╰── GtkContainer
                ├── GtkTable
                │   ╰── EComposerHeaderTable
                ╰── GtkBin
                    ╰── GtkWindow
                        ╰── EMsgComposer