title: how to use a converter inside a ResourceDictionary
body: <p>I have a converter thats works great when I use it as StaticResource on my Window as follows </p>
  
  <pre><code>&lt;UserControl.Resources&gt;
             &lt;local:ValidationErrorConverter x:Key="validationErrorConverter"/&gt;       
  &lt;/UserControl.Resources&gt;
  </code></pre>
  
  <p>I have a ResourceDictionary that defines my controls ControlTemplates and Styles , I couldn't figure out where to reference my converter as a StaticResource to be able to use it on my styles as follows</p>
  
  <pre><code>&lt;Style.Triggers&gt;
          &lt;Trigger Property="Validation.HasError" Value="true"&gt;
              &lt;Setter Property="ToolTip" Value="{Binding 
  RelativeSource={RelativeSource Self}, 
  Path=(Validation.Errors).CurrentItem, 
  Converter={StaticResource HERE??}}"/&gt;
          &lt;/Trigger&gt;
      &lt;/Style.Triggers&gt;
  </code></pre>