Enhancement in ESS Leave Request

Hi Gurus,

I am new to webdynpro Java. I have a requirement to add a custom button in a Standard ESS leave request (Webdynpro Java) view. When i click the the button it has to call popview(not sure is it possible to call a webdynpro abap view). If possible explain me with step by step preocedures(with screen shots).

Thanks,

Mohammed