Portal Transaction iView Button disabled

Hello expert,

I wish know why the button on menu of Pop-Up Portal are disabled.

I created a SAP Portal Transaction iView:

Image:

http://img718.imageshack.us/img718/7001/helpsdn.jpg

And the button NEW WINDOW is disabled, but if I put on the field where we type transaction: /ose37

then, a new window will open because I used /o

My question is: Why this button - NEW WINDOW is disabled? How can I enable this?

thanks.