Why "GtkWidget->window" is "NULL" when "gtk_window_new()"

["Wu Yin" <lazy.fox.wu@xxxxxxxxx>]

Code:
+----------------------------------------------------------
| GtkWidget *w;
|
| w = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+----------------------------------------------------------
Why the "w->window" is "NULL"?
The GdkDrawable is NULL ,how can I draw things on it?
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