Button widget is used to add a custom button to your webpage.

//Build the button object
$search =& $this->build("p4a_button","search"); 
//Assign a value to the button
$search->setValue("Go");                       
//Use intercept to assign action to this button
$this->intercept($search, "onClick","search");
 
//Now you can anchor this button where you want
$this->frame->anchor($search);