How do I enable users to add tables at runtime?

I would like to allow a user to be able to add tables to a pdf at runtime. To be clear, I have a table created and wish to add a set of buttons that allow a user to expand or add/subtract rows to a table with a button click, or similarly, add a complete table at runtime. I have figured out how to add rows but cannot get the table to work. I am using Adobe LiveCycle Designer ES2 on a Dell Latitude E6510 laptop with 32 bit Windows 7 pro.