WP8 Tap the image to get the selected item in long

I created a LongListSelector with textblock and an image,then How do I tap the image to show selected item name in my list, and tap the item name to show messagebox? Below is my code to bind the name and image:

<phone:PhoneApplicationPage.Resources>
        <DataTemplate x:Key="TileDataTemplate">
            <Grid Background="{StaticResource TransparentBrush}"
                  Margin="0, 0, 0, 12" Height="60">
                <TextBlock Text="{Binding Name}" Margin="60, 10, 0, 0" FontSize="24" Height="60">
                </TextBlock>
                <Image x:Name="GetName" Tap="GetName_Tap" Grid.Column="0" Source="/Assets/AppBar/Delete.png" Height="40" Width="40"
                                Margin="0, 6, 0, 5" HorizontalAlignment="Right" VerticalAlignment="Top" />
            </Grid>
        </DataTemplate>
</phone:PhoneApplicationPage.Resources>

    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <phone:LongListSelector
                    SelectionChanged="MainLongListSelector_SelectionChanged"
                    Margin="10,6,0,0"
                    ItemsSource="{Binding Staff.Items}"
                    LayoutMode="Grid"
                    GridCellSize="400,80"
                    ItemTemplate="{StaticResource TileDataTemplate}"
                    />
    </Grid>

Code Behind:

private void MainLongListSelector_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
   MessageBox.Show("Hi");
}

private void GetName_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
   LongListSelector selector = sender as LongListSelector;
   StaffData data = selector.SelectedItem as StaffData;
   MessageBox.Show(data.Name);
}

When I tap on textblock,the message "Hi" is displayed successful. But if I tap on image, I get the null value. How to I solve it? Thanks

sender isn't the LongListSelector but the image on which the user tapped, hence the null error.

Basically, you just want to retrieve the item on which the user has tapped? In that case, use the DataContext property of the tapped control to retrieve it:

private void GetName_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
   var element = (FrameworkElement)sender;
   StaffData data = (StaffData)element.DataContext;
   MessageBox.Show(data.Name);
}

(FrameworkElement is the base type of every UI control. Using that, you don't have to worry about whether it's an image, a textblock, ...)