silverlight wpf DataTemplate Command binding

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<Grid x:Name="LayoutRoot" Background="White">        <CommonControl:NoapDataGrid MinHeight="120" Margin="10,0,10,10" HorizontalAlignment="Stretch" AutoGenerateColumns="False" ItemsSource="{Binding FtpFiles}" >            <CommonControl:NoapDataGrid.Columns>                <c1:DataGridTextColumn Header="檔案名稱" Binding="{Binding FileName}"  />                <c1:DataGridTextColumn Header="檔案類型" Binding="{Binding FileType}"  />                <c1:DataGridTemplateColumn Header="操作">                    <c1:DataGridTemplateColumn.CellTemplate>                        <DataTemplate>                            <HyperlinkButton  Content="下載" Command="{Binding DataContext.DownloadFtpFileCommand, RelativeSource={RelativeSource AncestorLevel=2,AncestorType=Grid}}"/>                        </DataTemplate>                    </c1:DataGridTemplateColumn.CellTemplate>                </c1:DataGridTemplateColumn>            </CommonControl:NoapDataGrid.Columns>        </CommonControl:NoapDataGrid>    </Grid>

 或者

 <c1:DataGridTemplateColumn.CellTemplate>                        <DataTemplate>                            <HyperlinkButton  Content="下載" Command="{Binding DataContext.DownloadFtpFileCommand, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=UserControl}}"/>                        </DataTemplate>                    </c1:DataGridTemplateColumn.CellTemplate>

 

silverlight wpf DataTemplate Command binding