How to prepare Custom tag with scope as session like Struts tag

Hi
All Struts tags having the feature of Automatic Scoping.
Automatic Scoping: Struts tags check all contexts (namely page, request, session, application) and use the first instance found. Developers do not have to explicitly "retrieve" objects from a particular scope. They may, however, specify a context.
same as like struts tag I want to preapre 'select custom tag'.which will retrieve its previous selected value automatically and display.And one important thing is I dont want to set the selected value of custom tag in session expicitly.I mean the custom tag it self should take care to set the session vale and retrieve the sesion value and display like Struts tag . For struts select tag we wont set any selected value in session though it will retrieve the previous value and display when scope of form = session
regards
jagan

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