Hello J_Feuerstein,

Thank you for the feedback. I am glad that you have found a solution to your issue.

Hello Gergana,

I've tried out your solution, but it did not fit into my needs.
But I was able to modify it as I need it.
First, the IsTabStop property of the Field was what I want to bind the header look to.
So I modified the triggers as follows:

<!-- Style for the Header Labels, will display BOLD text for fields with IsTabStop=True -->
<Style TargetType="{x:Type igDP:LabelPresenter}">
  <EventSetter Event="PreviewMouseRightButtonDown" Handler="LabelPresenterPreviewMouseRightButtonDownHandler" />
  <Style.Triggers>
    <DataTrigger Binding="{Binding Path=Field.IsTabStop, RelativeSource={RelativeSource Self}}" Value="False">
      <Setter Property="FontWeight" Value="Normal" />
    </DataTrigger>
    <DataTrigger Binding="{Binding Path=Field.IsTabStop, RelativeSource={RelativeSource Self}}" Value="True">
      <Setter Property="FontWeight" Value="Bold" />
    </DataTrigger>
  </Style.Triggers>
</Style>

Second, I had to update the IsTabStop property of the associated field.
This is bound to a property of the viewmodel, so I have to update the source property.

/// <summary>

/// Flip the IsTabStop property of the field associated to the LabelPresenter.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void LabelPresenterPreviewMouseRightButtonDownHandler(object sender, MouseButtonEventArgs e)
{
  var labelPresenter = sender as LabelPresenter;
  if (labelPresenter == null)
    return;

  var field = labelPresenter.Field;
  if (field == null)
    return;

  var bindingExpression = BindingOperations.GetBindingBLOCKED EXPRESSION;
  }
}

 Maybe this is of some help for anyone else.

Hello J_Feuerstein,

I am just checking if you have any further questions on this matter. Please do not hesitate to let me know if you do.