How to do these description bubbles in FINAL CUT PRO

I been looking for an answer with no luck,
http://www.youtube.com/watch?v=nwMiBZPgTUU
0:22
It’s like a popup rectangle on which there’s text written,
How can I do this or something very similar on Final Cut Pro ?
Thank you.
~lionden~
Answer #1
Any one ?
Please it’s for a very big project I gotta know asap,
thank you
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