ListView.GroupHeaderTemplate BindingContext is null

Hi,

 I'm been working with ListView and can't seem to get the BindingContext to be set to anything. My XAML looks as follows (excluding DelegateGroupDescriptor and ItemTemplate):

<dc:RadListView

x:Name="HistoryList"
ItemsSource="{Binding History}"
 >
          
        <dc:RadListView.GroupHeaderTemplate>
          <DataTemplate>
            <StackLayout >
              <Label Text="{Binding }" TextColor="White"/>
            </StackLayout>
          </DataTemplate>
        </dc:RadListView.GroupHeaderTemplate>  

   </dc:RadListView>

The Binding in the DataTemplate is set to null.

Could this be a bug or am I doing something wrong?

Thanks