Change property of a page in Weblogic Portal

Hi all,
I'm new to Weblogic Portal and I'm trying to change the "Presentation class" property of a .page file, to add a css class to a div. After changing the file and starting the server, nothing seems to have changed. I'm accessing the portal through appmanager, but when I access it the normal way it doesn't work too.
This is the correct way of doing this?
Thanks in advance,
Joao Paulo

HI Baskaran,
In the existing functionality the class if_wd_component is being used to change the ui element property but now two elements have been binded to one context which is causing both the elements property to change when if_wd_component~set_enabled method is being used. Is there any other method that can be used to set the property of particular ui element of the context?
Praveen, thanks for the info, my current changes are in post exit only. I am looking for the right method to use to set the ui element property for bound context
My issue is similar to this thread: Issue for Hide fields and buttons in applications WD ABAP

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