We have a dialog that allows the user to choose the "type" of a shape: text, pop up and link. Changing the type also changes the modal's body. Our current design uses an underline to indicate the active "type" tab (like this site uses!). Every time I look at it, I feel as if I don't notice the other choices available. It seems as though attention to the choices is lost. I've validated this with a couple of our "beta" users and they didn't "realize" the other options were there.
I do like the look of this design since there isn't a lot of weight, but the other options don't seem noticeable.
The second design solidifies the selected "type". Does this design bring too much focus on this area? Would this increase the learn-ability of this UI?