How to handle unsaved data in portal through webdynpro ABAP ?

Hi Experts ,
I need to handle unsaved data in SAP Enterprise Portal through webdynpro for ABAP . I got a sdn link which explained some code for this..
http://help.sap.com/saphelp_nw70/helpdata/EN/45/b76f4169e25858e10000000a1550b0/frameset.htm
I tired to implement this in EXIT method of the view. but im not able to get this . Can any one help me in this ? .
Regards ,
Kalpana .

Hi ,
Yes i have checked the code . But the example itself not working when i linked the same with portal . If EXIT is not the right method , Can you help in placing the code in right method ? The code i pasted in EXIT method is
data L_COMPONENTCONTROLLER type ref to IG_COMPONENTCONTROLLER .
data L_API_COMPONENTCONTROLLER type ref to IF_WD_COMPONENT.
data L_PORTAL_MANAGER type ref to IF_WD_PORTAL_INTEGRATION.
L_COMPONENTCONTROLLER = WD_THIS->GET_COMPONENTCONTROLLER_CTR( ).
L_API_COMPONENTCONTROLLER = L_COMPONENTCONTROLLER->WD_GET_API( ).
L_PORTAL_MANAGER = L_API_COMPONENTCONTROLLER->GET_PORTAL_MANAGER( ).
call method L_PORTAL_MANAGER->SET_APPLICATION_DIRTY_FLAG
exporting
DIRTY_FLAG = ABAP_TRUE .

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