Hub.Header margin/border hides right aligned text

Hi,

I want to have some text aligned all the way to the right in the Hub.Header. But then there is a right margin/border that hides part of the text on the right side.

How do I get rid of that margin/border or how do I get the text to be all the way to the right?

This is what I have:

<Hub Name="MyHub">
    <Hub.Header>
        <TextBlock Text="Something" TextAlignment="Right" Width="{Binding ActualWidth, ElementName=MyHub}"></TextBlock>
    </Hub.Header>
    <HubSection>
        <DataTemplate>
            <TextBlock Text="Some content here"></TextBlock>
        </DataTemplate>
    </HubSection>
</Hub>