关于 silverlight DataGridColumnHeader 的背景色彩不能改变急帮帮忙

关于 silverlight DataGridColumnHeader 的背景颜色不能改变急帮帮忙啊
我是这样写的

命名空间
xmlns:Primitives="clr-namespace:System.Windows.Controls.Primitives;assembly=System.Windows.Controls.Data"

静态资源
<UserControl.Resources>
<Style x:Key="gridheader" TargetType="Primitives:DataGridColumnHeader">
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Color="White" Offset="0"/>
<GradientStop Color="Yellow" Offset="0.5"/>
<GradientStop Color="White" Offset="1"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Style>
</UserControl.Resources>

datagrid绑定了gridheader
<data:DataGridTextColumn Header="名称" Width="190" IsReadOnly="True" Binding="{Binding DevName,

Mode=OneWay}" HeaderStyle="{StaticResource gridheader}"/>

为什么datagrid 的header的背景颜色没有改变呢？
大家给看看怎么能改变header的背景颜色呢？

------解决方案--------------------
header的背景颜色这么改是改不掉的，要在模板里改，可以参考下面这个样式修改：

HTML code

 
  <Style x:Key="gridheader" TargetType="sdk:DataGridColumnHeader"> 
      <Setter Property="Foreground" Value="#FFB5B5B5" /> 
      <Setter Property="HorizontalContentAlignment" Value="Center" /> 
      <Setter Property="VerticalContentAlignment" Value="Center" /> 
      <Setter Property="FontSize" Value="10.5" /> 
      <Setter Property="FontWeight" Value="Bold" /> 
      <Setter Property="IsTabStop" Value="False" /> 
      <Setter Property="SeparatorBrush" Value="#FFDFE3E6" /> 
      <Setter Property="Padding" Value="4,4,5,4" /> 
      <Setter Property="Template"> 
      <Setter.Value> 
        <ControlTemplate TargetType="sdk:DataGridColumnHeader"> 
        <Grid Name="Root"> 
          <VisualStateManager.VisualStateGroups> 
          <VisualStateGroup x:Name="CommonStates"> 
            <VisualStateGroup.Transitions> 
            <VisualTransition GeneratedDuration="00:00:0.1" /> 
            </VisualStateGroup.Transitions> 
            <VisualState x:Name="Normal" /> 
            <VisualState x:Name="MouseOver"> 
            <Storyboard> 
              <ColorAnimationUsingKeyFrames BeginTime="0" Duration="0" Storyboard.TargetName="BackgroundRectangle" Storyboard.TargetProperty="(Shape.Fill).(SolidColorBrush.Color)"> 
              <SplineColorKeyFrame KeyTime="0" Value="#FF314D64"/> 
              </ColorAnimationUsingKeyFrames> 
              <ColorAnimationUsingKeyFrames BeginTime="0" Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)">

关于 silverlight DataGridColumnHeader 的背景色彩不能改变 急 帮帮忙

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关于 silverlight DataGridColumnHeader 的背景色彩不能改变急帮帮忙