In general, the table component is automatically resized when bound to a Dataprovider, see:
http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/2/dat aboundcomponents.html
But maybe this is what you are looking for:
http://developers.sun.com/prodtech/javatools/jscreator/reference/techart/2/conf ig_table_rows.html
http://developers.sun.com/prodtech/javatools/jscreator/reference/techart/2/crea teTableDynamically.html
http://blogs.sun.com/winston/entry/changing_table_look