Sorting Table Column

HI,
I have a Webdynpro table with two columns, the first colum displays Company Names and the Second one Company Nodes.
I would like to sort the fist column by Company Name and the second one by Company codes,
i have gone through the following tutorial
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/c092333b-0601-0010-e7af-8c227fb6d052
but its bit difficult to understand..
is there any simple steps and code..
Murali

All that i did is excuted company code Bapi.
public static void wdDoModifyView(IPrivateTableCompatibilityModeView wdThis, IPrivateTableCompatibilityModeView.IContextNode wdContext, com.sap.tc.webdynpro.progmodel.api.IWDView view, boolean firstTime)
    //@@begin wdDoModifyView
          if (firstTime) {
               IWDTable tablec = (IWDTable) view.getElement("CompanyTable");
                              wdContext.currentContextElement().setTableSorter(
                                   new TableSorter(tablec, wdThis.wdGetSortByCompanyNameAction(), null));
    //@@end
========================
public void onActionsortByCompanyName(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin onActionsortByCompanyName(ServerEvent)
     wdContext.currentContextElement().getCCodeSorter().sort(
                    wdEvent,
                    wdContext
                         .nodeBapi_Companycode_Getlist_Input()
                         .nodeOutput()
                         .nodeCompanycode_List());
    //@@end
after clicking on the header of the table following is the error stack
=======================
java.lang.NullPointerException
     at com.sap.tut.wd.tutwd_table.tablecomp.TableCompatibilityModeView.onActionsortByCompanyName(TableCompatibilityModeView.java:329)
     at com.sap.tut.wd.tutwd_table.tablecomp.wdp.InternalTableCompatibilityModeView.wdInvokeEventHandler(InternalTableCompatibilityModeView.java:318)
     at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.invokeEventHandler(DelegatingView.java:87)
     at com.sap.tc.webdynpro.progmodel.controller.Action.fire(Action.java:67)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleAction(WebDynproMainTask.java:101)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleActionEvent(WebDynproMainTask.java:304)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:649)
     at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:59)
     at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:248)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:154)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:116)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:55)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:390)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:264)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:347)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:325)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:887)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:241)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
     at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:95)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:160)
=================
Message was edited by: Murali Manohar

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