title: Windows phone: How to select all checkboxes (populated by DATA BINDING ) on button click?
body: <p>I have populated a listbox with checkboxes content using this code:    </p>
  
  <pre><code>&lt;StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="12,105,6,100"&gt;
              &lt;ListBox Name="ContactResultsData" ItemsSource="{Binding}" Height="393" Margin="0,0,0,0" &gt;
                  &lt;ListBox.ItemTemplate&gt;
                      &lt;DataTemplate&gt;
                          &lt;CheckBox  Name="xxx"  Content="{Binding Path=DisplayName, Mode=TwoWay}" Unchecked="xxx_Unchecked" Checked="xxx_Checked"&gt;&lt;/CheckBox&gt;
                      &lt;/DataTemplate&gt;
                  &lt;/ListBox.ItemTemplate&gt;
              &lt;/ListBox&gt;
  &lt;/StackPanel&gt;
  </code></pre>
  
  <p>Now I want to check all checkboxes on a button click, please help.</p>