RHEV ISO-Domain, no button

Hello,

Not sure what has happened, I opted to setup the ISO-DOMAIN during setup of REVM... however documents I read seem to say that when I expand, and highlite a datacenter and go to storage tab, there should be an Attach ISO button. I do not have this button... are the documents out of date? I can't import the domain as the NFS share is on my RHEVM server and that isn't listed, only the compute nodes...

Or am I blind and the button is hiding? I'm using RHEVM 3.4

Thanks
Bill