gtk_text_insert problem

[Jorge JUAN CHICO <jjchico imse cnm es>]

I've almost finished my first gtk program (a very simple one which draws a
curve in a window based in three parameters). Now I try to put Help button
to display a help window with some information. Everything goes right
except for the call to the gtk_text_insert function.

This is the function to create the help window:

GtkWidget *help_window_create(void)
{
  GtkWidget *window;
  GtkWidget *widget;
  GtkWidget *box;

  window = gtk_window_new(GTK_WINDOW_DIALOG);
  gtk_container_border_width(GTK_CONTAINER(window), 10);
  gtk_window_set_title(GTK_WINDOW(window), HELP_WINDOW_TITLE);

  box = gtk_vbox_new(FALSE, 0);

  widget = gtk_label_new(VERSION);
  gtk_box_pack_start(GTK_BOX(box), widget, FALSE, FALSE, 0);
  gtk_widget_show(widget);

  widget = gtk_hseparator_new();
  gtk_box_pack_start(GTK_BOX(box), widget, FALSE, FALSE, 0);
  gtk_widget_show(widget);

  widget = gtk_text_new(NULL, NULL);
  gtk_widget_set_usize(widget, 200, 200);
  gtk_text_set_word_wrap(GTK_TEXT(widget), TRUE); 
  gtk_text_set_editable(GTK_TEXT(widget), TRUE);
  gtk_widget_show(widget);

  /* does not work and don't know why */
  gtk_text_insert(GTK_TEXT(widget), 
      			    NULL, 
      			    NULL, 
      			    NULL, 
      			    HELP_TEXT, 
      			    -1); 

  gtk_text_set_editable(GTK_TEXT(widget), FALSE); 
  gtk_box_pack_start(GTK_BOX(box), widget, FALSE, FALSE, 0);

  widget = gtk_button_new_with_label(" Close ");
  gtk_signal_connect_object(GTK_OBJECT(widget), "clicked",
                            GTK_SIGNAL_FUNC(gtk_widget_hide),
                            GTK_OBJECT(window));
  gtk_box_pack_end(GTK_BOX(box), widget, FALSE, FALSE, 0);
  gtk_widget_show(widget);

  gtk_container_add(GTK_CONTAINER(window), box);
  gtk_widget_show(box);

  return window;
}

And the way I pop it up:

  ...
  button = gtk_button_new_with_label(" Help ");
  gtk_signal_connect_object(GTK_OBJECT(button), "clicked",
                            GTK_SIGNAL_FUNC(gtk_widget_show),
                            GTK_OBJECT(help_window));
  ...

I get the following error:

** ERROR **: file gtktext.c: line 697 (gtk_text_insert):
"GTK_WIDGET_REALIZED(text)"
Abort

on Sun Solaris using gtk 1.0 or

** ERROR **: sigsegv cought.

on Linux using gtk 1.2

If I ommit the call to gtk_set_text everythig goes OK and I get a blank
text frame where I can put and delete text.

What's wrong?

Please help.

jorge