Creating a Button Programatically in oaf

import oracle.apps.fnd.framework.webui.beans.form.OASubmitButtonBean;
import oracle.apps.fnd.common.VersionInfo;
import oracle.apps.fnd.framework.OAException;
import oracle.apps.fnd.framework.webui.OAControllerImpl;
import oracle.apps.fnd.framework.webui.OAPageContext;
import oracle.apps.fnd.framework.webui.OAWebBeanConstants;
import oracle.apps.fnd.framework.webui.beans.OAWebBean;

Creating the button programatically
  public void processRequest(OAPageContext pageContext, OAWebBean webBean)
  {
    //first excute standard functionality by call super as below
    super.processRequest(pageContext, webBean);
    //now create new button programatically
    OASubmitButtonBean oasb= (OASubmitButtonBean)pageContext.getWebBeanFactory().createWebBean(pageContext,"BUTTON_SUBMIT");
    oasb.setID("xxSubmitSendEmailButton");
    oasb.setUINodeName("xxSubmitSendEmailButton");
    oasb.setEvent("xxSubmitSendEmailButton");
    oasb.setText("xxSubmitSendEmailButton");
    webBean.addIndexedChild(oasb);
  }