带有ContextMenuService的LongListSelector

Question

我有LongListSelector：

<Controls:LongListSelector Height="Auto" x:Name="playlistList" HorizontalContentAlignment="Stretch" SelectionChanged="DidPressSelectItem"
                                       GroupHeaderTemplate="{StaticResource AddrBookGroupHeaderTemplate}"
                                       LayoutMode="List"
                                       IsGroupingEnabled="true" HideEmptyGroups="True">
              <Controls:LongListSelector.ItemTemplate>
                    <DataTemplate>
                        <local:SearchTemplateSelector Content="{Binding}" HorizontalContentAlignment="Stretch">
                            <toolkit:ContextMenuService.ContextMenu>
                                <toolkit:ContextMenu Loaded="ContextMenu_Load" Unloaded="ContextMenu_Unload">
                                </toolkit:ContextMenu>
                            </toolkit:ContextMenuService.ContextMenu>

                            <local:SearchTemplateSelector.Top100PlaylistTemplate>
                                  ........
                            </local:SearchTemplateSelector.Top100PlaylistTemplate>
                            <local:SearchTemplateSelector.PlaylistTemplate>
                                   ..............
                            </local:SearchTemplateSelector.PlaylistTemplate>
                         </local:SearchTemplateSelector>
                    </DataTemplate>
              </Controls:LongListSelector.ItemTemplate>
            </Controls:LongListSelector>

我在每个项目上都有一个长按下拉菜单，我也有几种TemplateSelector，我希望能够选择下拉菜单只能在其中一个模板。我怎么能实现它？