This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
If you are asking if you can dynamically add components to the current HtmlDataTable then the answer is yes.
If simply want to alter the number of rows without altering the format of the data table, then you can either bind the HtmlDataTable to a backing bean and change the value property or have a property wired to the value attribute of the HtmlDataTable.
If you want to dynamically alter the child components of a specific UIColumn bound to a HtmlDataTable and add an iframe, you have to create a custom component that simulates all the functions of an iframe and simply add the component as a child component of a UIColumn.
Uy Jerwin Louise Vergara
Junior Developer / Research and Development at Incuventure Partners Corporation