<richtextblock x:name="test3" xmlns:x="#unknown">
<paragraph FontSize="13.333" FontFamily="Arial">
<span x:name="Tsp1">Some Text....</span>
<span x:name="Tsp2">Some Text....</span>
<span x:name="Tsp3">Some Text....</span>
</paragraph>
</richtextblock>
Happy Coding!
:)