[glade--]unknown Widget type GtkLayout

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Hi all,

is GtkLayout supported via glademm ?
I get the following msgs when dropping a gtklayout into a window 
(nothing else). C++ is enabled.

-----------------------------8<-------------------------------------
Gtk-WARNING **: gtk_scrolled_window_add(): cannot add non scrollable 
widget use gtk_scrolled_window_add_with_viewport() instead
Changed dir to /home/plasma/Projects/project4
Found pkg-config version 0.12.0
Generating code for gtk 1.2.10 (pkg-config), gtkmm 1.2.10 
(gtkmm-config), [gnomemm 1.2.3 (pkg-config)]

glade--: unknown Widget type GtkLayout
-----------------------------8<-------------------------------------

Is there a list of supported Widgets ?

TIA
--
  Nabil Sayegh