Skinned XAML Task dialog conflict

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I have a skinned XAML task dialog based on the VistaTaskDialog sample. 

  <Dialog Name="Markers" AllowCancel="true" EnableMarkup="true"  MessageBoxStyle="true">
    <WindowTitle>Warning</WindowTitle>
    <MainInstruction Image="*Warning">blah blah blah</MainInstruction>
    <Content>blah content blah</Content>
    <Buttons>
      <Cancel/>
      <Button Foreground="Green" ID="101">&amp;button text</Button>
    </Buttons>
    <Footer Image="*Information">footer text</Footer>
  </Dialog>

My problem is the Button text color is shared by the label text color of the skin  (btnText in SkinBuilder).

I really need to override the button text color, but 

<Button Foreground="Green">

in the code above has no effect.  

Is there any way for the task dialog XAML to override the skin color?

Thanks.