Adding values to dropdown list programmatically

Hi, all
I have an arrayList as a set of choices for a dropdown list. how do i add it to the dropdown list programmatically?
thanx

this is what i'm trying to do: but there's error..
FacesContext fc = FacesContext.getCurrentInstance();
          UIViewRoot uiv = fc.getViewRoot();
          Application application = fc.getApplication();
          String oldValue = (String)valueChangedEvent.getOldValue();
          String newValue = (String)valueChangedEvent.getNewValue();
          if(getMenu2() != null)
               getMenu2().setRendered(true);
               UISelectItems items = (UISelectItems) fc.getApplication().createComponent(UISelectItems.COMPONENT_TYPE);
               items.setRendered(true);
               items.setValue(getBxDataMrgBean().getAlist());
               getMenu2().getChildren().add(items);
javax.servlet.ServletException: javax.servlet.jsp.JspException: null
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:821)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
     org.apache.jsp.Local.inputEC_jsp._jspService(inputEC_jsp.java:106)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     com.ibm.faces.context.MultipartExternalContextImpl.dispatch(MultipartExternalContextImpl.java:320)
     com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:295)
     com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
     com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
     com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
     com.hgst.plm.BomExtract.action.AuthenFilter.doFilter(AuthenFilter.java:49)
root cause
java.lang.ClassCastException
     com.sun.faces.renderkit.html_basic.MenuRenderer.getOptionNumber(MenuRenderer.java:508)
     com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:470)
     com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:428)
     javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:726)
     javax.faces.webapp.UIComponentTag.encodeEnd(UIComponentTag.java:604)
     javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:527)
     com.sun.faces.taglib.html_basic.SelectOneMenuTag.doEndTag(SelectOneMenuTag.java:473)
     org.apache.jsp.Local.inputEC_jsp._jspx_meth_h_selectOneMenu_1(inputEC_jsp.java:268)
     org.apache.jsp.Local.inputEC_jsp._jspx_meth_h_form_0(inputEC_jsp.java:188)
     org.apache.jsp.Local.inputEC_jsp._jspx_meth_hx_scriptCollector_0(inputEC_jsp.java:160)
     org.apache.jsp.Local.inputEC_jsp._jspx_meth_f_view_0(inputEC_jsp.java:131)
     org.apache.jsp.Local.inputEC_jsp._jspService(inputEC_jsp.java:97)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     com.ibm.faces.context.MultipartExternalContextImpl.dispatch(MultipartExternalContextImpl.java:320)
     com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:295)
     com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
     com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
     com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
     javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
     com.hgst.plm.BomExtract.action.AuthenFilter.doFilter(AuthenFilter.java:49)

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Change the order for dialogresults:
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didn't have a look for the find change problem

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