how I can print WPF treeview items over multiple pages?

Question

Hello friend, I want to print tree structure showing in WPF treeview control in multiple page. I tried PrintVisual() but it only prints only visible parts. Then I tried FlowDocument and written AddNode(), but its not showing the same result as treeview doimg. Please help me with code.

public void AddNodes(int uid, ListItem tSubNode)
    {
        string query = "select fullname, id from members where refCode=" + uid + ";";
        String memValue;
        MySqlCommand cmd = new MySqlCommand(query, db.conn);
        MySqlDataAdapter _DA = new MySqlDataAdapter(cmd);
        DataTable _DT = new DataTable();
        _DA.Fill(_DT);           
        ListOffset += 20;

        foreach (DataRow _dr in _DT.Rows)
        {
            ListItem tNode = new ListItem();
            tNode.Margin = new Thickness(ListOffset,0,0,0);
            memValue = _dr["fullname"].ToString() + " (" + _dr["id"].ToString() + ")";
            tNode.Blocks.Add(new Paragraph(new Run(hyp+memValue)));
            myList.ListItems.Add(tNode);
            flowDoc.Blocks.Add(myList);
            _fdrMembers.Document = flowDoc;
            if (db.HasMembers(Convert.ToInt32(_dr["id"].ToString())))
            { 
                AddNodes(Convert.ToInt32(_dr["id"]), tNode);
            }
        }
        ListOffset = 20;
    }

    private void button_Click(object sender, RoutedEventArgs e)
    {
        ListOffset = 0;
        myList.ListItems.Clear();
        tSuper.Blocks.Clear();
        if (db.GetNameByUID(100001) != null)
        {
            tSuper.Blocks.Add(new Paragraph(new Run(db.GetNameByUID(100001))));
            myList.ListItems.Add(tSuper);
            AddNodes(100001, tSuper);
        }           
        MessageBox.Show("Member by ID - "+does.ToString()+", "+dosnt.ToString(), "Error!", MessageBoxButton.OK, MessageBoxImage.Information);            
    }**strong text**