[gtkmm] disable clear area on expose event

[Jason Heblack <blackhesonja yahoo com>]

Hi!  Having trouble turning off the windows background
so that when 
there's an expose event, the background will remain as
is without being 
cleared first.

According to the gtkmm docs I think this should work
but it causes an 
error on my windows xp system:

Glib::RefPtr<Gdk::Window> window = get_window();
window->set_back_pixmap(0,false);

...: no matching function for call to
    `Gdk::Window::set_back_pixmap(int, bool)'
...: candidates are:
     void Gdk::Window::set_back_pixmap(const
     Glib::RefPtr<Gdk::Pixmap>&, bool)

Trying this compiles but causes a crash:

Glib::RefPtr<Gdk::Window> window = get_window();
const Glib::RefPtr<Gdk::Pixmap> *p=0 ;
window->set_back_pixmap(*p,false);





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