title: DataContext of DataTemplate in ToolTip Style in WPF
body: <p>I can't seem to find the right DataContext for the Grid in the ToolTipStyle Style. Just a blank ToolTip appears.</p>
  
  <pre><code>&lt;Window.Resources&gt;
      &lt;DataTemplate x:Key="ListTemplate"&gt;
          &lt;StackPanel&gt;
              &lt;Grid&gt;
                  &lt;TextBlock Text="{Binding Path=Name}"&gt;
                      &lt;TextBlock.ToolTip&gt;
                          &lt;ToolTip Style="{StaticResource ToolTipStyle}" /&gt;
                      &lt;/TextBlock.ToolTip&gt;
                  &lt;/TextBlock&gt;
              &lt;/Grid&gt;
          &lt;/StackPanel&gt;
      &lt;/DataTemplate&gt;
  
      &lt;Style TargetType="ToolTip" x:Key="ToolTipStyle"&gt;
          &lt;Setter Property="ContentTemplate"&gt;
              &lt;Setter.Value&gt;
                  &lt;DataTemplate&gt;
                      &lt;Grid&gt;
                          &lt;TextBlock Text="{Binding Path=Description}" /&gt;
                      &lt;/Grid&gt;
                  &lt;/DataTemplate&gt;
              &lt;/Setter.Value&gt;
          &lt;/Setter&gt;
      &lt;/Style&gt;
  &lt;/Windows.Resources&gt;
  
  &lt;ListBox ItemTemplate="{StaticResource ListTemplate}" /&gt;
  </code></pre>