title: Why does WP8 LongListSelector incorrectly re-use Checked state of CheckBox?
body: <p>I have a WP8 LongListSelector with the following template: </p>
  
  <pre><code>    &lt;DataTemplate x:Key="ItemTemplate"&gt;
          &lt;Grid Margin="0"&gt;
              &lt;Grid.ColumnDefinitions&gt;
                  &lt;ColumnDefinition Width="110"/&gt;
                  &lt;ColumnDefinition Width="*"/&gt;
                  &lt;ColumnDefinition Width="Auto"/&gt;
              &lt;/Grid.ColumnDefinitions&gt;
              &lt;controls:BlockImageControl 
                          Grid.Column="0"
                          Width="110"
                          Height="110"
                          Background="Transparent" /&gt;
              &lt;TextBlock x:Name="Name" 
                              Grid.Column="1"
                              Text="{Binding ScreenName}" 
                              FontSize="{StaticResource PhoneFontSizeLarge}"
                              FontWeight="Bold"
                              VerticalAlignment="Center"/&gt;
              &lt;CheckBox x:Name="Unblock" Grid.Column="2" VerticalAlignment="Center"
                        Tap="BlocksList_Tap"
                        IsChecked="false"
                        /&gt;
          &lt;/Grid&gt;
      &lt;/DataTemplate&gt;
  </code></pre>
  
  <p>As you can see there is a checkbox at the end of each cell item, which enables the user to select multiple items. IsChecked is false by default. </p>
  
  <p>The problem is that the LongListSelector seems to be caching the Checked state of my checkbox. If I check the very first, item, then scroll down partway, after about 30 or so items, I see another item checked which I did not select. The rest of the bindings work. It is as if it is ignoring the "IsChecked" property in the template. I tried binding the IsChecked attribute to a property, no luck. </p>
  
  <p>Does anyone know if this is a bug, and if not, how I can correct this behavior?</p>
  
  <p>Thanks!</p>
  
  <p><img src="https://i.stack.imgur.com/Uts2v.png" alt="enter image description here"></p>