public class CellRendererAvatar : Gtk.CellRendererPixbuf {
  private Contact _contact;
  
  public Contact contact {
    get {
      return _contact;
    }
    set {
      _contact = value;
      
      if(value == null) {
        pixbuf = null;
        return;
      }
      
      pixbuf = value.avatar;
    }
  }
}