How to display popup containing ALV table?

Hi Experts,

   I have a webdynpro ABAP report containing ALV table. Now the customer wants a new custom button "New" in the ALV toolbar.

   On pressing the "New" button a pop up window should open containing another ALV table with 5 editable rows. 

    Is this really possible?  Do I need to call another view on pressing "New" button? How can I do this?

   Please help.

Thanks

Gopal