Automatically add a new row when reaches the last row (word 2010)



I made a table in WORD 2010 and put 3 rows in it.
What i want is that if a user reaches the last row (no matter what cell in the last row), its automatically add a new row.
Or a Button when pressed is adding a row.

I hope this is possible and thank you very much.

p.s, sorry about my english if i have spelling mistakes