Exception while Creating Confirmation Dialog Window

Question

Hi,
Iam trying to create a confirmation Pop up window on the click of a "Save" button. I followed the procedure mentioned in the following link :
http://wiki.sdn.sap.com/wiki/display/WDJava/CreatingConfirmationDialogBoxinWebDynproJava
But when i click on Save button, iam getting this exception -
com.sap.tc.webdynpro.services.exceptions.CreationFailedException: add of choice failed! (eventhandler: null)
at the following line :
IWDConfirmationDialog confDialog = wdComponentAPI.getWindowManager().createConfirmationWindow(
  /* dialogText, evtHndlr, buttonText OR evtHndlr.getName() */
  wdComponentAPI.getTextAccessor().getText("GoHomeConfQuestion"),
  evtHndlr,
  wdComponentAPI.getTextAccessor().getText("GoHomeConfCancel")
Can any one please suggest me where iam going wrong and what is the cause of this exception?
Thanks in advance.
Regards,
Maggie

Answer 1

Sample code
dialog part
IWDConfirmationDialog createDialog=wdComponentAPI.getWindowManager().createConfirmationWindow("You are going to Submit.  Are you sure?",ctrl.findInEventHandlers("create"),"YES");
          createDialog.addChoice(ctrl.findInEventHandlers("doNothing"),"NO");
          createDialog.open();
you have to create event not the metod
  public void create(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
//your action
  public void doNothing(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
    //@@begin doNothing(ServerEvent)
//your action
    //@@end