Header not calling Converter

[Paul]

I have a GridView, and I am trying to set the Header text using a converter, e.g.,

<telerik:GridViewDataColumn UniqueName="LabelName"
  DataMemberBinding="{Binding LabelName}"
  Width="30*"
  Header="{Binding LabelName, Converter={StaticResource CtrlIdToLanguageTranslation},
      ConverterParameter='TRANSLATIONS_MANAGE_GRID_LABEL_ID', FallbackValue='Label Id'}"
  IsReadOnly="True"
  IsFilterable="False"
  IsGroupable="False"/>

I put a break point in the Converter class CtrlIdToLanguageTranslation and whilst this converter is being called for TextBlocks within the same page, no column header bindings are calling the converter. I know the binding is working because I can see the actual column data.

Cheers,

Paul