// Show floating window with tree of Places for select Place
        private void btn_show_tree_Places_Click(object sender, RoutedEventArgs e)
        {
            cwnd_selectPlace w = new cwnd_selectPlace();

            w.Show();
            w.Closed += new EventHandler(w_selectPlace_Closed);
        }
        // ChildWindow closed handler
        void w_selectPlace_Closed(object sender, EventArgs e)
        {
            cwnd_selectPlace tmpwindow = sender as cwnd_selectPlace;

            if (tmpwindow.DialogResult == true)
            {
                Ex_Pass.DevPlaceID   = tmpwindow.selectedItem.ID;
                Ex_Pass.DevPlacePath = tmpwindow.selectedItem.Description;
            }
        }