[Lazarus] Gtk-CRITICAL assertion

[Leonardo M. Ramé]

Hi, I'm building an app in an Ubuntu Linux 11.04.

When I open a form containing an couple of TComboBoxes and a TToolBar
with buttons linked to a TImageList, I get this assertion:

Gtk-CRITICAL **: IA__gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED
(widget) || GTK_IS_INVISIBLE (widget)' failed

Any hint?
-- 
Leonardo M. Ramé
http://leonardorame.blogspot.com