title: ComponentOne DataGrid Default Filter is not working
body: <p>Here is my dataGrid xaml:</p>
  
  <pre><code>&lt;c1datagrid:C1DataGrid x:Name="taskExecutionDetailC1DataGrid"
                                 Grid.Row="1" Grid.Column="0"
                                 SelectionMode="SingleCell"
                                 ItemsSource="{Binding ElementName=taskExecutionDetailDomainDataSource, Path=Data}"
                                 AutoGenerateColumns="True"
                                 CanUserFilter="True" c1:C1NagScreen.Nag="True" /&gt;
  </code></pre>
  
  <p>But, its not showing the filter icon (drop arrow) on hovering the header.</p>
  
  <p>I have referenced C1.Silverlight. DataGrid.Filters dll.</p>
  
  <p>Please Help. I have spent a lot of time on this grid, and now don't wanna leave it.</p>