Am trying to change default header style of a XamGrid using HeaderCellControl property in Silverlight 5 application but am not able to use HeaderCellControl property. It is throwing error in designer saying this property is not available in namespace "http://schemas.infragistics.com/xaml". Below is my code.

<ig:XamGrid Height="500" Margin="30 20 0 0" Width="500" BorderThickness="0" Background="#333333" x:Name="dataGrid" AutoGenerateColumns="false" ColumnWidth="*" ItemsSource="{Binding}">
  <ig:XamGrid.Columns>
  <ig:ColumnLayout Key="Portfolios" HeaderVisibility="false">
  <ig:ColumnLayout.Columns>
  <ig:TextColumn Key="Id" >
  <ig:TextColumn.HeaderTemplate>
  <DataTemplate>
  <TextBlock Text="Test ID" Foreground="#FFC000"/>
  </DataTemplate>
  </ig:TextColumn.HeaderTemplate>
  </ig:TextColumn>
  <ig:TextColumn Key="Name" >
    <ig:TextColumn.HeaderTemplate >
  <DataTemplate>
  <TextBlock Text="Test Name" Foreground="#FFC000"/>
  </DataTemplate>
  </ig:TextColumn.HeaderTemplate>
  </ig:TextColumn>
  </ig:ColumnLayout.Columns>
  </ig:ColumnLayout>

   <ig:TextColumn Key="SampleId" >
  <ig:TextColumn.HeaderTemplate>
  <DataTemplate>
  <TextBlock Text="Sample ID " Foreground="#FFC000"/>
  </DataTemplate>
  </ig:TextColumn.HeaderTemplate>
  </ig:TextColumn>
  <ig:TextColumn Key="SampleName" >
  <ig:TextColumn.HeaderTemplate>
  <DataTemplate>
  <TextBlock Text="Sample Name Foreground="#FFC000"/>
  </DataTemplate>
  </ig:TextColumn.HeaderTemplate>
  </ig:TextColumn>

 </ig:XamGrid.Columns>

</ig:XamGrid>

In UserControl.Resources, I tried to have setter property in style with TargetType = "ig:HeaderCellControl" but it is not working. Need help on this. Or if this is not possible them please let me know if there is any alternate solution to change default styles of whole XamGrid.