title: Binding value as ConverterParameter
body: <p>In my resourceDictionary I have a following style:</p>
  
  <pre><code> &lt;Style TargetType="{x:Type propgrid:PropertyGridDataAccessorItem}" x:Key="{x:Type propgrid:PropertyGridDataAccessorItem}"&gt;
              &lt;Style.Triggers&gt;
                  &lt;Trigger Property="DataAccessorType" Value="Category"&gt;
                      &lt;Setter Property="IsExpanded" Value="{Binding DisplayName, Converter={local:ExpandedCategoryConverter}}"/&gt;
                  &lt;/Trigger&gt;
              &lt;/Style.Triggers&gt;
    &lt;/Style&gt;
  </code></pre>
  
  <p>I need to bind a value from my viewModel to ConverterParameter, something like ConverterParameter = {Binding MyProperty}, but we can't bind to a ConverterParameter. </p>
  
  <p>How can I solve this issue?</p>
  
  <p>Thnx in advance</p>