How To Create Expandable Text Boxes In Adobe Acrobat X/LiveCycle?

Hello,

I have both Adobe Acrobat X and Adobe LiveCycle.

I am trying to create a PDF form that has expandable text boxes. I would like for users to be able to type in a text box that would expand as the user types and once they are done typing and click somewhere else on the form the text box would then revert back to its original size but still maintain the contents typed. Is this possible? Any help would be appreciated.

Thanks!