Why "gtk_toolbar_append_element", "gtk_toolbar_append_widget", ... ... should be deprecated ?

["向斌" <xb_parasite tom com>]

Hi,all
I am a new commer to gtk programming.Today I  got two small questions.
1.
Why "gtk_toolbar_append_element","gtk_toolbar_append_widget", ... ... should be deprecated ?
If I do not use those deprecated function ,how can I add widget to the GtkToolbar .

2.
GtkWidget*  gtk_toolbar_insert_stock        (GtkToolbar *toolbar,
                                             const gchar *stock_id,
                                             const char *tooltip_text,
                                             const char *tooltip_private_text,
                                             GtkSignalFunc callback,
                                             gpointer user_data,
                                             gint position);
What the use of  the parameter "const char *tooltip_private_text" in function "gtk_toolbar_insert_stock".

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