Customizing Silverlight 5 DataGrid Headers

We’re currently working on a client application that captures time sheet information and needed the ability to completely customize the look and feel of DataGrid headers.  Fortunately, that’s fairly straightforward to do in Silverlight 3 (or Silverlight 2 for that matter).  Nearly all of the columns being used are DataGridTemplateColumn types (although that’s not required to customize headers) and changing the header is accomplished by using the HeaderStyle property as shown next:

<data:DataGridTemplateColumn Header="Tue" HeaderStyle="{StaticResource TimeSheetDayHeaderStyle}">
    <data:DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <TextBox Text="{Binding TuesdayQuantity}" Style="{StaticResource TimeSheetTextBoxStyle}"/>
                <Rectangle Fill="#FFC9CACA" VerticalAlignment="Stretch" Width="1" />
                <TextBox Text="{Binding TuesdayHours}" Margin="2,0,0,0" Style="{StaticResource TimeSheetTextBoxStyle}"/>
            </StackPanel>
        </DataTemplate>
    </data:DataGridTemplateColumn.CellTemplate>
</data:DataGridTemplateColumn>

see the link http://weblogs.asp.net/dwahlin/archive/2009/06/11/customizing-silverlight-3-datagrid-headers.aspx