Draw your vector box. You can use the "draw text with a vector box" and you'll get a screen to the left of your computer screen. You'll be able to type your text there and center it in the box. If you draw you box and then type you text using the "draw text" icon, you would then click you text and while holding down the shift key, select your box. Then click the "align selected object" icon and then us the "align to selection" section to align your text in the box.
Shark HD 2.0