A problem about tooltips

[rukelee <czy0404 163 com>]

Hi, 
    I found a porbelm, but i can.t make a solution, help?

/* create a button of tooltips on/off in the toolbar */
  icon = gtk_image_new_from_file ("gtk.xpm");
  tooltips_button = gtk_toolbar_append_element (GTK_TOOLBAR(toolbar),
                                               
GTK_TOOLBAR_CHILD_TOGGLEBUTTON,
                                                NULL,
                                                "Tooltips On/Off",
                                                "Toolbar with or without
tips",
                                                "Private",
                                                icon,
                                                G_CALLBACK(toggle_event),
                                                toolbar);
  gtk_toolbar_append_space(GTK_TOOLBAR(toolbar));
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON(tooltips_button),TRUE);

/* use the tooltips_button to set widgets in the toolbar show/or not show
tooltips, when the mouse approaches  */
/* it's the callback function,but it can't work*/
void toggle_event (GtkWidget *widget,
                   gpointer data)
{
  gtk_toolbar_set_tooltips (GTK_TOOLBAR (data),
                            GTK_TOGGLE_BUTTON (widget)->active);
}

any good idea, how can i improve it?
tks!
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