window phone - How to disable current select item? - xaml

Question

I have a xaml :
<phone:LongListSelector Name="llsSourceNews" ItemsSource="{Binding SourceNews}">
<phone:LongListSelector.ItemTemplate>
<DataTemplate>
<Grid x:Name="gridNews">
<Grid.RowDefinitions>
<RowDefinition Height="80" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="120"/>
<ColumnDefinition Width="250"/>
<ColumnDefinition Width="40"/>
</Grid.ColumnDefinitions>
<Image Grid.Row="0" Grid.Column="0" Source="{Binding icon}" Stretch="Fill" Height="35" Width="70"></Image>
<TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding Name}" Foreground="White" TextWrapping="Wrap" FontSize="24" VerticalAlignment="Center"></TextBlock>
<Image Grid.Row="0" Grid.Column="2" Source="/Images/Add-New.png" x:Name="imgAdd" Tap="imgAdd_Tap"></Image>
</Grid>
</DataTemplate>
</phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>
and tap event :
private void imgAdd_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
if(true)
{
this.Visibility = Visibility.Collapsed;
}
}
My problem is : when user tap image,all image is disable.I want to image is disable which is selected.

Answer 1

this in your case refers to the page. If you want to retrieve the image, you have to cast the sender parameter:
private void imgAdd_Tap(object sender, System.Windows.Input.GestureEventArgs e)
{
if(true)
{
var element = (FrameworkElement)sender;
element.Visibility = Visibility.Collapsed;
}
}