Excessive flashing with flow document

I'm new to wpf so I'm not sure if my comment is valid. I'm playing with a
table control which I have housed in a flow document. In page mode or two
page mode when I'm not on the first page the background is redrawn (producing
a flashing effect) when data in the table has changed. Page 1 in both modes
does not exhibit this behavior. I would think the same logic could have been
done for subsequent pages. In case you need the code for my example, here it
is:

using System;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Controls;
using System.Threading;
using System.Collections;
using System.Collections.Generic;

public class Cell
{
private int _row;
private int _column;
private object _value;

public Cell(int row, int column, object value)
{
this._row = row;
this._column = column;
this._value = value;
}

public int Row
{
get
{
return this._row;
}
}

public int Column
{
get
{
return this._column;
}
}

public object Value
{
get
{
return this._value;
}
}
}

public class Application
{
private static Table _table = null;
private static EventWaitHandle _shutdown = null;
private delegate void UpdateTableEventHandler(ICollection<Cell> updates);

public static void DoUpdates()
{
int i;
int row;
int column;
int value;
Random random;
List<Cell> updates;
bool done;

random = new Random();
for (done = false; !done; )
{
updates = new List<Cell>();
for (i = 0; i < 200; i++)
{
row = random.Next(1000);
column = random.Next(3);
value = random.Next(1313);
updates.Add(new Cell(row, column, value));
}
Application._table.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.SystemIdle,
new UpdateTableEventHandler(Application.UpdateTable), updates);
if (Application._shutdown.WaitOne(100, false))
done = true;
}
}

static void UpdateTable(ICollection<Cell> updates)
{
foreach(Cell c in updates)
{
((IList)
Application._table.RowGroups[1].Rows[c.Row].Cells[c.Column].Blocks)[0] =
new Paragraph(new Run(c.Value.ToString()));
}
}

[STAThread]
public static void Main()
{
System.Windows.Application app;
TableRow row;
TableColumn column;
int i;
Thread dataProvider;
System.Threading.Timer timer;

Application._shutdown = new EventWaitHandle(false,
EventResetMode.ManualReset);
app = new System.Windows.Application();
app.MainWindow = new System.Windows.Window();
app.MainWindow.Content = new ScrollViewer();
Application._table = new Table();
((ScrollViewer) app.MainWindow.Content).Content = new FlowDocument();
((FlowDocument) ((ScrollViewer)
app.MainWindow.Content).Content).Blocks.Add(_table);
app.MainWindow.Show();

// Now modify the table.

column = new TableColumn();
column.Name = "FirstColumn";
_table.Columns.Add(column);
column = new TableColumn();
column.Name = "SecondColumn";
_table.Columns.Add(column);
column = new TableColumn();
column.Name = "ThirdColumn";
_table.Columns.Add(column);
_table.RowGroups.Add(new TableRowGroup());
_table.RowGroups[0].Rows.Add(new TableRow());
row = _table.RowGroups[0].Rows[0];
row.Background = Brushes.Silver;
row.FontSize = 20;
row.FontWeight = System.Windows.FontWeights.Bold;
row.Cells.Add(new TableCell(new Paragraph(new Run("First Column"))));
row.Cells.Add(new TableCell(new Paragraph(new Run("Second Column"))));
row.Cells.Add(new TableCell(new Paragraph(new Run("Third Column"))));
_table.RowGroups.Add(new TableRowGroup());
for (i = 0; i < 1000; ++i)
{
_table.RowGroups[1].Rows.Add(new TableRow());
row = _table.RowGroups[1].Rows[i];
row.Cells.Add(new TableCell(new Paragraph(new Run(string.Format("row {0}
column 1", i)))));
row.Cells.Add(new TableCell(new Paragraph(new Run(string.Format("row {0}
column 2", i)))));
row.Cells.Add(new TableCell(new Paragraph(new Run(string.Format("row {0}
column 3", i)))));
}


dataProvider = new Thread(new ThreadStart(DoUpdates));
dataProvider.Start();
// timer = new System.Threading.Timer(new TimerCallback(DoUpdates), null,
new TimeSpan(0, 0, 0, 20),
// new TimeSpan(0, 0, 0, 0, 3000));
app.Run();
Application._shutdown.Set();
dataProvider.Join();
}
}

--
Thanks,
Nick

nicknospamdu@xxxxxxam
remove "nospam" change community. to msn.com