Creating the button programmatically

  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);
  }

Dynamically creating of Advance Table  Bean:

 private void setReportSumText(OAPageContext pageContext, OAWebBean webBean) 
  {
    OAAdvancedTableBean advancedTableBean = (OAAdvancedTableBean)webBean.findIndexedChildRecursive("BuyerTableRN");
    advancedTableBean.prepareForRendering(pageContext);
    if (advancedTableBean != null)
    {
      OATableFooterBean tableFooterBean = (OATableFooterBean)advancedTableBean.getFooter();
      if(tableFooterBean != null)
      {
        OATotalRowBean totalRowBean = (OATotalRowBean)tableFooterBean.getTotal();
        if(totalRowBean != null)
        {
          totalRowBean.setText("Report-Sum");
        }
      }
   }
  }