ListView Desgin时可以显示数据，运行时无法显示

Question

先谢过各位高手和热心人。以下是步骤

1在资源中用x:Data写入静态Xml提供给XmlDataProvider，

2然后写入CollectionViewSource资源，其Source绑定到上面的XmlDataProvider

3通过CollectionViewSource资源提供数据给ListView，并填写View的GridView

现象，设计时数据正常显示，运行时结果无法显示。

环境，VisualStudio2010

代码

资源部分

        <XmlDataProvider x:Key="TestDataProvider" XPath="Customers/*">
            <x:XData>
                <Customers>
                    <Customer DisplayName="Customer1" Email="[e-mail]" IsCompany="True"  TotalSales="300200"></Customer>
                    <Customer DisplayName="Customer2" Email="[e-mail]" IsCompany="True"  TotalSales="600200"></Customer>
                    <Customer DisplayName="Customer3" Email="[e-mail]" IsCompany="False"  TotalSales="3000"></Customer>
                    <Customer DisplayName="Customer4" Email="[e-mail]" IsCompany="False"  TotalSales="4000"></Customer>
                    <Customer DisplayName="Customer5" Email="[e-mail]" IsCompany="False"  TotalSales="5000"></Customer>
                </Customers>
            </x:XData>
        </XmlDataProvider>

       <CollectionViewSource x:Key="TestCollectionViewSourceCustomers2"
                              Source="{Binding Source={StaticResource TestDataProvider}}">
        </CollectionViewSource>

窗体部分

    <DockPanel>
        <ListView DockPanel.Dock="Top"
            ItemsSource="{Binding Source={StaticResource TestCollectionViewSourceCustomers2}}">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Name" DisplayMemberBinding="{Binding XPath=@DisplayName}">
                    </GridViewColumn>
                    <GridViewColumn Header="Email" DisplayMemberBinding="{Binding XPath=@Email}">
                    </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>
    </DockPanel>

谢谢！！