how to access datagrid control in silverlight

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C#

ASP.NET

Silverlight

Dear All,
I make a datagrid that contron a progress bar and i want to access progress bar when i upload files and other content and run the progress bar on every file uploading. I make a multifile uploading system. Please help me i give code below.
<pre lang="c#"> <data:DataGrid Name="FileList" LoadingRow="DataGrid_LoadingRow" Margin="0,0,6,6" AutoGenerateColumns="False" Loaded="FileList_Loaded">
<data:DataGrid.Columns>
<data:DataGridTextColumn CanUserReorder="True" CanUserResize="True" CanUserSort="True" Header="File Name" Width="150" Binding="{Binding Name}"/>
<data:DataGridTextColumn CanUserReorder="True" CanUserResize="True" CanUserSort="True" Header="File Size" Width="80" Binding="{Binding Length}" />
<data:DataGridTemplateColumn Header="Status">
<data:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel>
<ProgressBar x:Name="progressBar2" Minimum="0" Maximum="{Binding Length}" Visibility="Visible" IsEnabled="False" Width="50" Height="15"/>
</StackPanel>
</DataTemplate>
</data:DataGridTemplateColumn.CellTemplate>
</data:DataGridTemplateColumn>
<data:DataGridTemplateColumn>
<data:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel>
<Button Name="btnremove" Content="Remove" Click="btnremove_Click"></Button>
</StackPanel>
</DataTemplate>
</data:DataGridTemplateColumn.CellTemplate>
</data:DataGridTemplateColumn>
</data:DataGrid.Columns>

<!--<ProgressBar x:Name="progressBar" Minimum="0" Maximum="{Binding FileLength}" Value="{Binding BytesUploaded}" Visibility="Collapsed" />-->
</data:DataGrid>

//////////////////////////////////////////////////////////
private void button1_Click(object sender, RoutedEventArgs e)
{
progressBar1.Value = 0;
if (listBox1.SelectedIndex == -1)
{
MessageBox.Show("Please Select Sku No");
return;
}
if (listBox2.SelectedIndex == -1)
{
MessageBox.Show("Please Select PhotoGrapher Name");
return;
}
long PId = ((skuUploading.GetDataSerivces.login)(((System.Windows.Controls.Primitives.Selector)(listBox2)).SelectedItem)).RefferenceID;
long sku = ((skuUploading.GetDataSerivces.trackWork)(((System.Windows.Controls.Primitives.Selector)(listBox1)).SelectedItem)).JabongBarCode;
string data = string.Empty;
foreach (var file in fileColl)
{
using (System.IO.Stream fileStream = GetFileData(file.OpenRead()))
{
StreamResourceInfo oStreamResource = new StreamResourceInfo(fileStream, null);
byte[] array = new byte[oStreamResource.Stream.Length];
oStreamResource.Stream.Read(array, 0, (int)oStreamResource.Stream.Length);
data = Convert.ToBase64String(array);
WebClient oWebClient = new WebClient();

string fileName = Guid.NewGuid().ToString().Replace("-", "") + file.Extension;
oWebClient.UploadStringAsync(new Uri("http://localhost:51982/FileUpload.ashx?file=" + fileName + "&sku=" + sku + "&pid=" + PId), null, data, fileName);
oWebClient.UploadProgressChanged += new UploadProgressChangedEventHandler(oWebClient_UploadtxtProgressChanged);
// oWebClient.UploadStringCompleted += new UploadStringCompletedEventHandler(oWebClient_UploadStringCompleted);
TotalFileToUpload += 1;
data = string.Empty;
//var ctl = (FileList.Columns[3]) as ProgressBar;
//var ctl = Fi as ProgressBar;
//if(ctl!=null)
//{
// var pname = (ProgressBar)ctl.DataContext;

//}
}
}
}
void oWebClient_UploadtxtProgressChanged(object sender, UploadProgressChangedEventArgs e)
{

TotalFileUploaded += 1;
txtProgress.Text = string.Empty;
txtProgress.Text = !string.IsNullOrEmpty(txtProgress.Text) ? (int.Parse(txtProgress.Text) + e.BytesSent).ToString() : e.BytesSent.ToString();
//((ProgressBar)(FileList.CurrentColumn.GetCellContent(TotalFileUploaded))).IsEnabled = true;
//((ProgressBar)(FileList.CurrentColumn.GetCellContent(TotalFileUploaded))).Value = e.BytesSent;
DataGridRow drw=new DataGridRow ();
drw.DataContext="progressBar2";
<b>ProgressBar pg = ((ProgressBar)(FileList.Columns[2].GetCellContent(totalfileuploaded).FindName("progressBar2")));
progressBar1.Value = e.BytesSent;</b>
if (TotalFileUploaded == TotalFileToUpload)
txtProgress.Text = TotalFileUploaded + " files uploaded successfully (" + txtProgress.Text + " bytes sent )";
fileColl.Clear();
}
</pre>
plz help me