SRM Shopping Cart NXP iView closes Portal window

Hi Guys,

               I am using SAP Standard SRM Shopping Cart NXP (UI5) iView.

Even though I set the property "Launch in New Window" to "Display in portal Content Area", still its opening up in a new window and Portal pop-up windows with a Question "The webpage you are viewing is trying to close the tab.. Do you want to close this tab ?".

How to control this behaviour ?

Thanks

Sam