public ComboListWindow( HSimpleComboBox combo_parent )
     : base(Gtk.WindowType.Popup)
 {
     this.combo_parent   = combo_parent;
     this.Build();
     this.Visible        = false;
 }
 public ComboListWindow(HSimpleComboBox combo_parent) :
     base(Gtk.WindowType.Popup)
 {
     this.combo_parent = combo_parent;
     this.Build();
     this.Visible = false;
 }