Transaction iView opening in a separate window in SAP NW 7.3 portal

Hi Experts

I have created a transaction iView for LSO transaction.The iView is a SAP GUI for HTML type.When I am trying to open the iView from the portal , it opens in a separate tab instead of as a pop-up window.

The Launch in a New window property is set to Display in the portal content area.

If I try to edit the Launch in a window property and set it to Lock in target objects , it opens in the portal content area, but I want it to open in a complete new window as a pop-up.

I have attached screenshot of the expected result.

Please suggest.

Regards

Shaily