Add Control To a Form at runtime

Hi

I am new to Metastorm and I am using 9.0 Version.

I have a requirement in which I need to add rows/Controls  (3 dropdowns and 1 text box) to a form on a button click at run time, similarly I need to delete the rows on button press.

Attached the screen shot of the sample page. Can some one please help me out in achieving this feature.

Thanks

Swetha.