This will make the text in the TextBlock vertical
<TextBlock Text="Some Text">
<TextBlock.LayoutTransform>
<TransformGroup>
<RotateTransform Angle="90" />
<ScaleTransform ScaleX="-1" ScaleY="-1"/>
</TransformGroup>
</TextBlock.LayoutTransform>
</TextBlock>
As always, feel free to comment, or ask.