GtkStatusbar::push
int push(int context_id, string text);
push() prepends the given
message to an internal stack in the statusbar, along with its
associated context_id. It is best to allow
the statusbar to generate the context_id for
itself, as the value can then change from one run to another to respond
to the user's pattern of interaction with the application. Use
get_context_id() to do this.
The returned value is a unique message_id, which is
needed as a parameter in the
remove() method. This is
simply an incremented value, beginning at 1.
This method causes the
"text-pushed" signal to be
emitted.
