How to Customize the Standard UWL component

Hello Experts,
We have a requirement to customize the standard UWL component.
But I am not sure how to get standard UWL source code in NWDS and how to create a custom DC from the standard component with different namespace.
Can anyone please guide me how to achieve this requirement?
Regards,
Sambaran Chakraborty

REPOST with proper format:::
HI Amar,
Thanks for you input.
But we have no option except to go with this customization of UWL; we are in middle of SAP upgrade (NW 7.01 SP07).
Previously we were in NW 7.0 SP10) and that time we were customized the UWL component.
But after upgrade it is not allowing us to deploy the old UWL custom component.
Therefore we have decided to customize the UWL component again with current version.
Now for NW 7.01 SP07 SAP is not providing the source code(SRC>ZIP) for UWLJWF.sac file. But we are able to get the source code for NW 7.01 SP00.
Now we have successfully able to build and deploy a local DC from the SRC.ZIP file from UWLJWF.sac of NW 7.01 SP00.
Then we have created an iview and call the UWL Substitution Application from the custom UWL DC. But when we checked in the UWL Substitution screen we get few issue:
1.     In the UWL Substitution screen there is not text available for any of the button.
2.     When we clicked on first button (should be Create Rule button, though no text available for our case) we got an error message of incompatibility, below is the error:
java.lang.ClassCastException: com.sap.netweaver.bc.uwl.ui.wdp.InternalUWLPeoplePickerInterface$External incompatible with com.sap.netweaver.bc.uwl.ui.pp.wdp.IExternalUWLCustomPicker        at com.sap.netweaver.bc.uwl.ui.subst.wdp.InternalSubstitutionRuleView.wdGetUWLCustomPickerInterface(InternalSubstitutionRuleView.java:362)
        at com.sap.netweaver.bc.uwl.ui.subst.SubstitutionRuleView.wdDoInit(SubstitutionRuleView.java:179)
        at com.sap.netweaver.bc.uwl.ui.subst.wdp.InternalSubstitutionRuleView.wdDoInit(InternalSubstitutionRuleView.java:255)
        at com.sap.tc.webdynpro.progmodel.generation.DelegatingView.doInit(DelegatingView.java:61)
        at com.sap.tc.webdynpro.progmodel.controller.Controller.initController(Controller.java:215)
        at com.sap.tc.webdynpro.progmodel.view.View.initController(View.java:445)
        at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:200)
        at com.sap.tc.webdynpro.progmodel.view.ViewManager.getView(ViewManager.java:709)
        at com.sap.tc.webdynpro.progmodel.view.ViewManager.bindRoot(ViewManager.java:579)
        at com.sap.tc.webdynpro.progmodel.view.ViewManager.makeVisible(ViewManager.java:793)
        at com.sap.tc.webdynpro.progmodel.view.ViewManager.performNavigation(ViewManager.java:296)
        at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.navigate(ClientApplication.java:767)
        at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.navigate(ClientComponent.java:881)
        at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.doNavigation(WindowPhaseModel.java:498)
        at com.sap.tc.webdynpro.clientserver.window.WindowPhaseModel.processRequest(WindowPhaseModel.java:144)
        at com.sap.tc.webdynpro.clientserver.window.WebDynproWindow.processRequest(WebDynproWindow.java:335)
        at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:143)
        at com.sap.tc.webdynpro.clientserver.session.ApplicationSession.doProcessing(ApplicationSession.java:333)
        at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessingStandalone(ClientSession.java:741)
        at com.sap.tc.webdynpro.clientserver.session.ClientSession.doApplicationProcessing(ClientSession.java:694)
        at com.sap.tc.webdynpro.clientserver.session.ClientSession.doProcessing(ClientSession.java:253)
        at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:149)
        at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:62)
        at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:53)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
        at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
        at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:386)
        at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:364)
        at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:1039)
        at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:265)
        at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
        at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
        at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
        at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
        at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
        at java.security.AccessController.doPrivileged(AccessController.java:219)
        at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:104)
        at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:176)
Can you please provide your valuable input on this condition?
Any help from anyone on this issue will be highly appreciated.
Regards,
Sambaran Chakraborty

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