GtkLabel::parse_uline
int parse_uline(string string);
parse_uline() checks the
string passed as the parameter for underscores, and then underlines
the characters following the underscores. It will take the first
underlined character in a label and return it as a lower-case
accelerator key, e.g. _Save will return the
accelerator key value for "s".
This method is used internally by Gtk+ for menu items.
Note that this method is deprecated in GTK+ 2.0.
$label->parse_uline("_File");
