focus_out_event' on GTK_COMBO(..)->entry crashes

[calmar <mac calmar ws>]

Hi,          
I have this in my source (trying to fetch the data from a combobox, when 
the box loses the focus)
g_signal_connect (G_OBJECT (GTK_COMBO (combo)->entry), "focus_out_event",
                     G_CALLBACK (deck_callback), NULL);

(on gtk+ 2.0 for windows)
What happens is ... when the focus is lost, the programm correctly calls 
the callback function, but right after it (almost same time, or when the 
callback funktion is finished) , it crashes with this messagewindow :

//

Gtk_ERROR **. file gtkentry.c: line 4221 (blink_cb): assertion failed: 
(GTK_WIDGET_HAS_FOCUS(entry))
aborting
//

Maybe I just can't do this, or maybe I did it wrong, or maybe it's a 
problem from 'MS windows GTK+-2.0' (on winXP)?

Thanks for any hints

calmar