How to use markup in GtkLabel

1. create a normal
2. set to use with
3. see all markups available;
4. or just create blank
5. set the markup text with
GtkLabel;
2. set to use with
GtkLabel::set_use_markup;
3. see all markups available;
4. or just create blank
GtkLabel;
5. set the markup text with
GtkLabel::set_markup;