如何更改silverlight datagrid header的背景

header的背景颜色要在模板里改，可以参考下面这个样式修改

<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)"> 
                            <SplineColorKeyFrame KeyTime="0" Value="#4C363B5C"/> 
                          </ColorAnimationUsingKeyFrames> 
                          <ColorAnimationUsingKeyFrames BeginTime="0" Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)"> 
                            <SplineColorKeyFrame KeyTime="0" Value="#7F363B5C"/> 
                          </ColorAnimationUsingKeyFrames> 
                          <ColorAnimationUsingKeyFrames BeginTime="0" Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)"> 
                            <SplineColorKeyFrame KeyTime="0" Value="#F2FFFFFF"/> 
                          </ColorAnimationUsingKeyFrames> 
                          <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)"> 
                            <SplineColorKeyFrame KeyTime="00:00:00" Value="#FF363B5C"/> 
                          </ColorAnimationUsingKeyFrames> 
                          <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Offset)"> 
                            <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0.013"/> 
                          </DoubleAnimationUsingKeyFrames> 
                        </Storyboard> 
                      </VisualState> 
                    </VisualStateGroup> 
                    <VisualStateGroup x:Name="SortStates"> 
                      <VisualStateGroup.Transitions> 
                        <VisualTransition GeneratedDuration="00:00:0.1" /> 
                      </VisualStateGroup.Transitions> 
                      <VisualState x:Name="Unsorted" /> 
                      <VisualState x:Name="SortAscending"> 
                        <Storyboard> 
                          <DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="Opacity" Duration="0" To="1.0"/> 
                        </Storyboard> 
                      </VisualState> 
                      <VisualState x:Name="SortDescending"> 
                        <Storyboard> 
                          <DoubleAnimation Storyboard.TargetName="SortIcon" Storyboard.TargetProperty="Opacity" Duration="0" To="1.0"/> 
                          <DoubleAnimation Storyboard.TargetName="SortIconTransform" Storyboard.TargetProperty="ScaleY" Duration="0" To="-.9"/> 
                        </Storyboard> 
                      </VisualState> 
                    </VisualStateGroup> 
                  </VisualStateManager.VisualStateGroups> 
  
                  <Grid.RowDefinitions> 
                    <RowDefinition Height="*" /> 
                    <RowDefinition Height="*" /> 
                    <RowDefinition Height="Auto" /> 
                  </Grid.RowDefinitions> 
                  <Grid.ColumnDefinitions> 
                    <ColumnDefinition Width="Auto" /> 
                    <ColumnDefinition Width="*" /> 
                    <ColumnDefinition Width="Auto" /> 
                  </Grid.ColumnDefinitions> 
  
                  <Rectangle x:Name="BackgroundRectangle" Stretch="Fill" Fill="#FF33C421" Grid.ColumnSpan="2" Grid.RowSpan="2"/> 
  
                  <Rectangle x:Name="BackgroundGradient" Stretch="Fill" Grid.ColumnSpan="2" Grid.RowSpan="2"> 
                    <Rectangle.Fill> 
  
                      <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> 
                        <GradientStop Color="#FFA6A6A6"/> 
                        <GradientStop Color="#FF000000" Offset="1"/> 
                        <GradientStop Color="#FF636363" Offset="0.33500000834465027"/> 
                        <GradientStop Color="#FF262626" Offset="0.621"/> 
                      </LinearGradientBrush> 
  
                    </Rectangle.Fill> 
                  </Rectangle> 
  
                  <ContentPresenter 
                         Grid.RowSpan="2" 
                         Content="{TemplateBinding Content}" 
                         Cursor="{TemplateBinding Cursor}" 
                         HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 
                         VerticalAlignment="{TemplateBinding VerticalContentAlignment}" 
                         Margin="{TemplateBinding Padding}"/> 
  
                  <Rectangle Name="VerticalSeparator" Grid.RowSpan="2" Grid.Column="2" Width="1" VerticalAlignment="Stretch" Fill="{TemplateBinding SeparatorBrush}" Visibility="{TemplateBinding SeparatorVisibility}" /> 
  
                  <Path Grid.RowSpan="2" Name="SortIcon" RenderTransformOrigin=".5,.5" HorizontalAlignment="Left" VerticalAlignment="Center" Opacity="0" Grid.Column="1" Stretch="Uniform" Width="8" Data="F1 M -5.215,6.099L 5.215,6.099L 0,0L -5.215,6.099 Z " Fill="#FF82CAAB"> 
                    <Path.RenderTransform> 
                      <TransformGroup> 
                        <ScaleTransform x:Name="SortIconTransform" ScaleX=".9" ScaleY=".9" /> 
                      </TransformGroup> 
                    </Path.RenderTransform> 
                  </Path> 
  
                </Grid> 
              </ControlTemplate> 
            </Setter.Value> 
          </Setter> 
  
        </Style> 

导入到blend里面，右键编辑样式就行了