Set selected item on ContextMenu open action wp7

How I can set selected item or get listbox item in which I have ContextMenu?

                   <local:TypeTemplateSelector Content="{Binding}">
                  <local:TypeTemplateSelector.WithAudio>
                    <DataTemplate>
                      <Grid Margin="0,5">
          开发者_运维百科              <toolkit:ContextMenuService.ContextMenu>
                          <toolkit:ContextMenu Open="needselect"  x:Name="databoundMenu">
                            <toolkit:MenuItem  Header="I Like It"/>
                            <toolkit:MenuItem>
                              <toolkit:MenuItem.Header>
                                <CheckBox Content="Tell" ></CheckBox>
                              </toolkit:MenuItem.Header>
                            </toolkit:MenuItem>
                          </toolkit:ContextMenu>
                        </toolkit:ContextMenuService.ContextMenu>
                        <StackPanel>
                          <TextBlock Text="{Binding h}"/>
                        </StackPanel>
                      </Grid>
                    </DataTemplate>
                  </local:TypeTemplateSelector.WithAudio>

I'm not sure if I understand your question: you have a listbox in which each item has a contextmenu and in the context menu you want to know the selected item ? Here's my usage of the contextmenu

<DataTemplate>
<Border>
    <toolkit:ContextMenuService.ContextMenu>
        <toolkit:ContextMenu>
            <toolkit:MenuItem Header="Move" Command="{Binding MoveCurrentCommand}" CommandParameter="{Binding}"  />
       </toolkit:ContextMenu>
    </toolkit:ContextMenuService.ContextMenu>
    <Grid Margin="0,0,0,15" Height="100">
    (...)