Silverlight：X：在转换WPF应用程序时键入Silverlight

Question

我正在将功能从WPF转换为Silverlight（对我而言是新的），我遇到了x：Type属性的问题。这是我的xaml

 <sdk:TabControl Name="tabDynamic" ItemsSource="{Binding}" SelectionChanged="tabDynamic_SelectionChanged">
        <sdk:TabControl.Resources>
            <DataTemplate x:Key="TabHeader" DataType="sdk:TabItem">
                <toolkit:DockPanel>
                    <Button Name="btnDelete" toolkit:DockPanel.Dock="Right" Margin="5,0,0,0" Padding="0" Click="btnDelete_Click" CommandParameter="{Binding RelativeSource={RelativeSource AncestorType={x:Null TabItem}}, Path=Name}">
                    <Image Source="/delete.gif" Height="11" Width="11"></Image>
                    </Button>
                    <TextBlock Text="{Binding RelativeSource={RelativeSource AncestorType=sdk:TabItem}, Path=Header}"/>
                </toolkit:DockPanel>
             </DataTemplate>

找不到X：类型。

<Button Name="btnDelete" toolkit:DockPanel.Dock="Right" Margin="5,0,0,0" Padding="0" Click="btnDelete_Click" CommandParameter="{Binding RelativeSource={RelativeSource AncestorType={x:Null TabItem}}, Path=Name}">

有没有办法支持Silverlight中的x：Type标记？