diff -r 2717213c588a -r 9f66f99ee56f windowing/windowserver/nga/SERVER/openwfc/cliwin.cpp
--- a/windowing/windowserver/nga/SERVER/openwfc/cliwin.cpp	Tue Jun 22 15:21:29 2010 +0300
+++ b/windowing/windowserver/nga/SERVER/openwfc/cliwin.cpp	Fri Sep 24 16:14:28 2010 +0300
@@ -1426,6 +1426,13 @@
 			iFlags&=~EFlagScreenDeviceInvalid;
 		else
 			iFlags|=EFlagScreenDeviceInvalid;
+		
+		MWsWindowTreeObserver* windowTreeObserver = iScreen->WindowTreeObserver();
+		if (windowTreeObserver)
+			{
+			windowTreeObserver->FlagChanged(*this, MWsWindowTreeObserver::EScreenDeviceValid, aState);
+			}
+		
 		return ETrue;
 		}
 	return EFalse;