Gtk.MessageDialog.prototype.get_message_area

function get_message_area():Gtk.Widget {
    // Gjs wrapper for gtk_message_dialog_get_message_area()
}

Returns the message area of the dialog. This is the box where the dialog's primary and secondary labels are packed. You can add your own extra content to that box and it will appear below those labels, on the right side of the dialog's image (or on the left for right-to-left languages). See Gtk.Dialog.prototype.get_content_area for the corresponding function in the parent Gtk.Dialog.

Since 2.22