How Do I Export Dropdown's Selected Value From Silverlight Radgridview

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C#

Telerik

I am using Silverlight telerik:RadGridView with MVVM binding. In it I have used GridViewComboBoxColumn which is not exporting selected value during export to excel.

Code is as below.

       <telerik:RadGridView x:Name="gvFollowUp" IsReadOnly="False" GridLinesVisibility="Both" CanUserReorderColumns="True" 
                             CanUserFreezeColumns="False" AutoGenerateColumns="False"  AutoExpandGroups="True"  IsFilteringAllowed="True" ItemsSource="{Binding FollowUpList}"
                             RowIndicatorVisibility="Collapsed" VerticalAlignment="Top" Margin="0,0,0,0" ShowColumnFooters="False" HorizontalAlignment="Stretch" 
                             ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Auto" Height="Auto" Grid.Row="1"
                             NewRowPosition="Top" CellValidating="gvFollowUp_CellValidating" ValidatesOnDataErrors="InEditMode" CanUserInsertRows="True" 
                             EditTriggers="Default">            
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="BeginningEdit">
                    <cmd:EventToCommand Command="{Binding BegningEdit}" PassEventArgsToCommand="True"/>
                </i:EventTrigger>
                <i:EventTrigger EventName="RowEditEnded">
                    <cmd:EventToCommand Command="{Binding RowEditEnd}" PassEventArgsToCommand="True"/>
                </i:EventTrigger>
                <i:EventTrigger EventName="AddingNewDataItem">
                    <cmd:EventToCommand Command="{Binding AddingNewDataItem}" PassEventArgsToCommand="True"/>
                </i:EventTrigger>
            </i:Interaction.Triggers>            
            <telerik:RadGridView.Columns>

<telerik:GridViewDataColumn Header="File #" x:Name="gvcFileNo" IsReadOnlyBinding="{Binding flg_completed, Converter={StaticResource BoolConverter},ConverterParameter=gvcFileNo}" 
                                            UniqueName="FileNo">
                    <telerik:GridViewDataColumn.CellTemplate>
                        <DataTemplate>
                            <HyperlinkButton NavigateUri="{Binding thisFollowUp.URUrl}" Content="{Binding LookUpReferenceCode.c2, Mode=OneTime}" ></HyperlinkButton>
                        </DataTemplate>
                    </telerik:GridViewDataColumn.CellTemplate>
                    <telerik:GridViewDataColumn.CellEditTemplate>
                        <DataTemplate>
                            <telerik:RadAutoCompleteBox x:Name="rcmbReference"
                                                DisplayMemberPath="c2"                                                                                                               
                                                SelectionMode="Single"
                                                SelectedItem="{Binding LookUpReferenceCode, Mode= TwoWay}"
											    ItemsSource="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DataContext.ReferenceNo}"	
                                                BorderThickness="1"                                                                                                 
                                                HorizontalAlignment="Left"
                                                AutoCompleteMode="SuggestAppend"/>
                        </DataTemplate>
                    </telerik:GridViewDataColumn.CellEditTemplate>
                </telerik:GridViewDataColumn>
<telerik:GridViewComboBoxColumn x:Name="rcmbStatus"
                                                Header="Status"                                                                                  
                                                DataMemberBinding="{Binding LookUpSuspenseStatus, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" 
                                                DisplayMemberPath="c2"  
                                                FilterMemberPath="LookUpSuspenseStatus.c2"                                                
                                                ItemsSourceBinding="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=DataContext.StatusLookUp}"
                                                IsReadOnlyBinding="{Binding flg_completed, Converter={StaticResource BoolConverter},ConverterParameter=Status}" 
                                                IsVisible="False">
                </telerik:GridViewComboBoxColumn>
</telerik:RadGridView.Columns>
        </telerik:RadGridView>






 public RelayCommand ExportCommand
        {
            get
            {
                return _ExportCommand
                    ?? (_ExportCommand = new RelayCommand(
                                          () =>
                                          {
                                              RadGridView grid = (Helper.Content.Content as Alis.Accounting.Controls.UCFollowUp).gvFollowUp;
                                              if (grid != null)
                                              {
                                                  grid.ElementExporting -= CurrentGrid_ElementExporting;
                                                  grid.ElementExporting += CurrentGrid_ElementExporting;

                                                  string extension = "xls";
                                                  var format = ExportFormat.Html;

                                                  var dialog = new SaveFileDialog();
                                                  dialog.DefaultExt = extension;
                                                  dialog.Filter = String.Format("{1} files (*.{0})|*.{0}|All files (*.*)|*.*", extension, "Excel");
                                                  dialog.FilterIndex = 1;
                                                  //dialog.DefaultFileName = "Follow Up-" + DateTime.Now.Date.ToShortDateString();

                                                  if (dialog.ShowDialog() == true)
                                                  {                                                     
                                                      using (var stream = dialog.OpenFile())
                                                      {
                                                          var exportOptions = new GridViewExportOptions();
                                                          exportOptions.Format = format;
                                                          exportOptions.ShowColumnFooters = true;
                                                          exportOptions.ShowColumnHeaders = true;
                                                          exportOptions.ShowGroupFooters = true;
                                                          
                                                          grid.Export(stream, exportOptions);
                                                      }
                                                  }
                                              }
                                          }));
            }
        }