title: How to get a window handle of GTK# widget or container?
body: <p>I use libvlc_media_player_set_hwnd() function in GTK# (Xamarin). But I can't get a HWND of GTK# widget and set it in libvlc_media_player_set_hwnd() function.
  In GTK+ I can use gdk_x11_drawable_get_xid(), but I haven't found this function in GTK#.</p>
  
  <p>So how I can get a HWND of widgets or use this function for output media in the needed window/container/widget?</p>