GtkFixed disables expand propertiy of GtkVBox ?

[sphurti durgade <sphurti study yahoo com>]

Hi
i am packing /putting notebook and one search box into fixed (GtkFixed). and this  fixed is packed into vbox 
with expand  and fill  parameter  as TRUE . so that when i maximized window only notebook get expand  but 
when i maximized  window   the notebook is not get expanded  
i am not getting where i am wrong. and not getting how fixed working .
please can anybody  help me . The code is as follows 


    vbox = gtk_vbox_new (FALSE, 0);

    /*----- Notebook------*/
    notebook = gtk_notebook_new ();
    gtk_notebook_set_tab_pos (GTK_NOTEBOOK (notebook), GTK_POS_TOP);

    label = gtk_label_new ("tab1");
    tab = gtk_frame_new("Frame1");
    gtk_widget_set_size_request(tab,300,450);
    gtk_notebook_append_page (GTK_NOTEBOOK(notebook ), tab, label);

    label = gtk_label_new ("tab2");
    tab =  gtk_frame_new("Frame2");
    gtk_notebook_append_page (GTK_NOTEBOOK(notebook ), tab, label); 
     
    /*----search box -----*/
    label = gtk_label_new ("Search");
    tab = gtk_entry_new_with_max_length (20);

     hbox = gtk_hbox_new (FALSE, 0);
     gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
     gtk_box_pack_start (GTK_BOX (hbox), tab, FALSE, FALSE, 0);
    
    fixed= gtk_fixed_new();
    gtk_fixed_put (GTK_FIXED(fixed),notebook,3,3);
    gtk_fixed_put (GTK_FIXED(fixed),hbox,100,3);

    gtk_box_pack_start (GTK_BOX (vbox), fixed, TRUE, TRUE, 0); 
    gtk_container_add (GTK_CONTAINER (window),vbox);
    gtk_widget_show_all(window);


    Thank you 
    sphurti

 



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