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POHow to drag a listboxitem in WP7?
 

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  1. POHow to drag a listboxitem in WP7?
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    <p>As the codes below, I have a listboxitem. I want to drag the listboxitem horizontally to right and disappear. but when drag it, this error pops up,</p> <p>transform.X += e.HorizontalChange;<strong>[NullReferenceException]</strong></p> <p>I check the Watch, found that the e.HorizontalChange has a value of 65.0, why it shows error? and How I accomplish my goal?</p> <pre><code>&lt;DataTemplate x:Key="TasksListDataTemplate"&gt; &lt;StackPanel x:Name="stackPanel" Margin="0,0,0,10" RenderTransformOrigin="0.5,0.5"&gt; &lt;toolkit:GestureService.GestureListener&gt; &lt;toolkit:GestureListener DragDelta="taskitem_DragDelta" &lt;/toolkit:GestureService.GestureListener&gt; &lt;TextBlock x:Name="textBlock" TextWrapping="Wrap" Text="{Binding Title}" FontSize="{StaticResource PhoneFontSizeLarge}" HorizontalAlignment="Left" Width="432" RenderTransformOrigin="0.5,0.5"&gt; &lt;/TextBlock&gt; &lt;StackPanel x:Name="stackPanel1" Orientation="Horizontal" HorizontalAlignment="Left"&gt; &lt;TextBlock x:Name="textBlock1" TextWrapping="Wrap" Text="due:" d:LayoutOverrides="Width" FontSize="{StaticResource PhoneFontSizeMedium}" RenderTransformOrigin="0.5,0.5"&gt; &lt;/TextBlock&gt; &lt;TextBlock x:Name="textBlock2" TextWrapping="Wrap" Text="{Binding DueDate}" d:LayoutOverrides="Width" FontSize="{StaticResource PhoneFontSizeMedium}" RenderTransformOrigin="0.5,0.5"&gt; &lt;/TextBlock&gt; &lt;/StackPanel&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; </code></pre> <p>and the code behind file is </p> <pre><code> private void taskitem_DragDelta(object sender, DragDeltaGestureEventArgs e) { TranslateTransform transform = (sender as StackPanel).RenderTransform as TranslateTransform; transform.X += e.HorizontalChange; } </code></pre>
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