How to close the pop up window ?????

Hi All,

I have a requirement wherein a webdynpro application opens as a pop up window by clicking a wokitem in a UWL.I have to provide a close button in the pop up window and on click of the button,pop up window should close and control is taken back to the workitem in UWL..Please elaborate your answer in steps by steps...

I will appreciate a gud response.Reward points will be awarded.

Thanxs.

Amit