How to create Information Dialog boxes in web Dynpro

Hi,
'm new to webdynpro.
Can any body help me to create a dialog box.
I would like to know how to create dialog boxes of type information, confirmation and warning
expects reply
thanks
smitha

to create confirmation dialog I tried the code
 IWDControllerInfo controllerInfo = wdControllerAPI.getViewInfo().getViewController();
 String dialogText = "The email was successfully sent!";
 IWDConfirmationDialog dialog =wdComponentAPI.getWindowManager().createConfirmationWindow( dialogText, controllerInfo.findInEventHandlers("ok"), "ok");
 dialog.addChoice(controllerInfo.findInEventHandlers("newEmail"), "new email");
 dialog.open();
and I got error like:
java.lang.NullPointerException
 at com.sap.tc.webdynpro.clientserver.window.ConfirmationDialogDelegate.<init>(ConfirmationDialogDelegate.java:58)
 at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.createConfirmationWindow(ClientComponent.java:926)
 at com.enteg.systallocpkg.LoginView.onActionLogin(LoginView.java:157)
 at com.enteg.systallocpkg.wdp.InternalLoginView.wdInvokeEventHandler(InternalLoginView.java:137)
 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:100)
 at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.handleActionEvent(WebDynproMainTask.java:299)
 at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:635)
 at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:59)
 at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:249)
 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:385)
 at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:263)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:340)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:318)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:821)
 at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:239)
 at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
 at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)
 at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
 at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
 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:94)
 at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162)
I don't know how to solve this
can any body help me
Smitha

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