Why Window doesn't appear back ???

Question

Hi
Experts
//get the repository content at runtime of the Web-Dynpro-
// Window “AddressbookWindow”
IWDWindowInfo windowInfo = (IWDWindowInfo)wdComponentAPI
.getComponentInfo()
.findInWindows("AddressbookWindow");
//create the “AddressbookWindow”
IWDWindow window = wdComponentAPI.getWindowManager()
.createWindow( windowInfo, true);
//set the WindowPosition on the screen
window.setWindowPosition(300, 150);
//and show the window
window.open();
// Save WindowInstance in Context
wdContext.currentPopupElement().setWindowInstance(window);
here at saving time i get an error that is
  java.lang.NullPnterException
So At present what i do is i write window variable here instread of storing it to context
//@@begin others
IWDWindow window;
//@@end
(Problem & Process Is explained below please try to help me)
Actually what happens is it finds the addressbook window from repository
but when coming back to original window it just display blank screen.
I make one mail window and one addressbook window.
If someone clink on addressbook on to option of mail window,
one small adressbook window get opend.
and when on adressbook window anyone click on button
it fires one event that is in component controller.
and i make it's event handler in the email window.
But problem is that at returning time it just give me blank screen.
Thanking you.
Sunny.

Answer 1

I mailed project to your mail id.
Created one Controller context variable (type - com.sap.tc.webdynpro.services.session.api.IWDWindow) and mapped it to both views.
From Source view, i am calling on select on button this logic.
IWDWindowInfo windowInfo = (IWDWindowInfo) wdComponentAPI.getComponentInfo().findInWindows("PopupWindow");
IWDWindow popupWin =                     wdComponentAPI.getWindowManager().createModalWindow(windowInfo);
popupWin.setWindowPosition(300, 350);
popupWin.setWindowSize(100,100);
popupWin.setTitle("Search Popup");
wdThis.wdGetPopupCompController().wdGetContext()
.currentContextElement().setSearchPopup(popupWin);
popupWin.show();
"PopupWindow" - is popup window name.
From Popup view Back Button, use this logic.
IWDWindow thisWindow = wdThis.wdGetPopupCompController().wdGetContext().currentContextElement().getSearchPopup();
thisWindow.destroyInstance();
//closing the popup window
Hope it is working for you.
Regards,
Sridhar