I guess you are saying the Tag Editor is empty?
One common mistake is when going to the tag browser Controller Address tags come up by default. If you look at the bottom there will be tabs for other sections of tags. For example an Ethernet Panelview will have 3 tabs saying ENet-Controller Address, ENet-Assembly Object, and ENet-CIP.
If that isn't it can you give the part number of your Panelview, explain where you can't see the tags, and if we still can't figure it out post your code?