Description of problem:
Since that latest update of gtk2 applications created with lazarus run into an exception on close.

Version-Release number of selected component (if applicable):
gtk2-2.24.7-1.fc16.i686
lazarus-0.9.30-1.fc16.i686
fpc-2.4.2-2.fc15.i686
fpc-src-2.4.2-2.fc15.i686

How reproducible:
allways

Steps to Reproduce:
1. create a new application
2. start the application from terminal
3. close the application
  
Actual results:
The following error-message is raised:

(bewerbungen:17621): Gtk-CRITICAL **: IA__gtk_widget_unrealize: assertion `GTK_IS_WIDGET (widget)' failed

(bewerbungen:17621): Gtk-CRITICAL **: IA__gtk_widget_is_toplevel: assertion `GTK_IS_WIDGET (widget)' failed
TApplication.HandleException Access violation
  Stack trace:
  $4F65EDD8
exception at 4F65EDD8:
Access violation.
**
GLib-GObject:ERROR:gsignal.c:711:emission_pop: code should not be reached
Abgebrochen

Expected results:
The application should be closed without any exception

Additional info:
My application sourcecode hasn't been changed since at last one week so this can only be caused by the latest gtk2 update