Pb in writing a widget !

[jflecomte idealx com (Lecomte Jean François)]

Hi there,

I'm tring to write a widget gtk_tag which should derivate from a vbox 

 struct _GtkTag
  {
    GtkVBox vbox;

    GtkWidget *title;
    GtkWidget *drawing_extent;
  };

and should look like:


-------------------------------------
|    |   LABEL                       |
|    |                               |
| DA --------------------------------
|    |   VBOX                        |
|    |                               |
-------------------------------------

where DA is some drawing area

In fact, i want a vbox with some decorations around it.
then i want to be able to write

gtk_box_pack_start (GTK_BOX (tag_widget), any_widget, FALSE, FALSE, 0);

where tag_widget is one instance of the new created widget.



But i have some pbs...

in the gtk_tag_init function ,

static void
gtk_tag_init (GtkTag *tag)
{
  GtkWidget *hbox1;
  GtkWidget *vbox1;



  GTK_WIDGET_SET_FLAGS (tag, GTK_NO_WINDOW);
  
  hbox1 = gtk_hbox_new (FALSE, 0);
  gtk_widget_show(hbox1);
  tag->drawing_extent = gtk_drawing_area_new ();
  gtk_widget_show(tag->drawing_extent);
  gtk_box_pack_start (GTK_BOX (hbox1), tag->drawing_extent, TRUE, TRUE, 0);
  gtk_widget_set_usize (tag->drawing_extent, 100, -2);

  vbox1 = gtk_vbox_new (FALSE, 0);
  gtk_widget_show(vbox1);
  gtk_box_pack_start (GTK_BOX (hbox1), vbox1, TRUE, TRUE, 0);
  
  tag->title = gtk_label_new (_("Youhou"));
  gtk_widget_show(tag->title);
  gtk_box_pack_start (GTK_BOX (vbox1), tag->title, FALSE, FALSE, 0);
  

  gtk_box_pack_start (GTK_BOX (vbox1), GTK_WIDGET(tag), TRUE, TRUE, 0);

}


the last line produce a 

Gtk-CRITICAL **: file gtkcontainer.c: line 715 (gtk_container_add)
: assertion `widget->parent == NULL' failed.

And then i'm unable to cast my gtk_tag in gtk_box !

Could someone tell me how do i have to do this
or give me some pointer of such widgets...


thanks.

-- 
-- 
J-François LECOMTE                      IDEALX S.A.S.