怎么wpf中用数据触发器，动态的改变ListView中的背景颜色
xaml:

[code=C#]
<ListView x:Name="lvData">

                            <ListView.ContextMenu>
                                <ContextMenu Opened="cmRight_Opened" Name="cmRight">
                                    <MenuItem Name="start1" Header="启动" Click="start_Click"></MenuItem>
                                    <MenuItem Name="stop1" Header="停止" Click="stop_Click"></MenuItem>
                                    <MenuItem Name="pause1" Header="暂停" Click="pause_Click"></MenuItem>
                                    <MenuItem Name="resume1" Header="恢复" Click="resume_Click"></MenuItem>
                                    <MenuItem Header="重新启动"></MenuItem>
                                    <Separator/>
                                    <MenuItem Header="所有任务">
                                        <MenuItem Name="start" Header="启动" Click="start_Click"></MenuItem>
                                        <MenuItem Name="stop" Header="停止" Click="stop_Click"></MenuItem>
                                        <MenuItem Name="pause" Header="暂停" Click="pause_Click"></MenuItem>
                                        <MenuItem Name="resume" Header="恢复" Click="resume_Click"></MenuItem>
                                        <MenuItem Header="重新启动"></MenuItem>
                                    </MenuItem>
                                    <Separator/>
                                    <MenuItem Name="refresh" Header="刷新" Click="refresh_Click"></MenuItem>
                                </ContextMenu>
                            </ListView.ContextMenu>

   <!--<SnippetItemContainerStyle>-->
   <ListView.ItemContainerStyle>
    <Style TargetType="{x:Type ListViewItem}"  >
      <Setter Property="Template"
            Value="{StaticResource Default}"/>
      <Style.Triggers>
        <DataTrigger Binding="{Binding XPath=Name}" Value="System">
    <Setter Property="Template"
                Value="{StaticResource StronglyRecommended}"/>
        </DataTrigger>
        <DataTrigger Binding="{Binding XPath=CPU}" Value="00">
          <Setter Property="Template"
                Value="{StaticResource Recommended}"/>
        </DataTrigger>
      </Style.Triggers>
 </Style>
  </ListView.ItemContainerStyle>
<!--</SnippetItemContainerStyle>-->

<!--<SnippetGridView>-->
  <ListView.View>
    <GridView  ColumnHeaderContainerStyle="{StaticResource MyHeaderStyle2}">
       
      <GridViewColumn Header="进程ID"
                      DisplayMemberBinding="{Binding XPath=Handle}"
                      Width="100"/>
      <GridViewColumn Header="名称"
                      DisplayMemberBinding="{Binding XPath=Name}"
                      Width="80"/>
      <GridViewColumn Header="用户名"
                      DisplayMemberBinding="{Binding XPath=CSName}"
                      Width="80" />
      <GridViewColumn Header="线程数"
                      DisplayMemberBinding="{Binding XPath=ThreadCount}" 
                      Width="100"/>
       <GridViewColumn Header="会话ID"
                      DisplayMemberBinding="{Binding XPath=SessionId}" 
                          Width="100"/>
        <GridViewColumn Header="内存使用"
                      DisplayMemberBinding="{Binding XPath=WorkingSetSize}" 
                      Width="100"/>
        <GridViewColumn Header="高峰内存使用"
                      DisplayMemberBinding="{Binding XPath=PeakWorkingSetSize}" 
                      Width="100"/>
        <GridViewColumn Header="CPU"
                      DisplayMemberBinding="{Binding XPath=CPU}"
                      Width="100"/>
        <GridViewColumn Header="CPU时间"
                      DisplayMemberBinding="{Binding XPath=CPUTime}" 
                      Width="100"/>
        <GridViewColumn Header="描述"
                      DisplayMemberBinding="{Binding XPath=Description}" 
                      Width="100"/>
        <GridViewColumn Header="IO"
                      DisplayMemberBinding="{Binding XPath=OtherOperationCount}" 
                      Width="100"/>
       
    </GridView>
  </ListView.View>
<!--</SnippetGridView>-->
  </ListView>
[/code]

后台代码
/// <summary>
/// 得到所有的进程信息，并数据绑定
/// </summary>
public void GetAllProcess(string ip, string userName, string password)
{
     IList<Process> processes = ProcessManager.GetAllProcess(ip, userName, password);
     lvData.ItemsSource = processes;
}

怎么就触发不了呢，请大侠们帮忙？