[amohr]

When you pop up a comment, the hide and delete buttons are kind of confusing. The hide icon uses a 'minimize' analogy, which leads me to believe the 'x' icon means 'close.' On a related note, the popover doesn't really need to say 'comment,' it's pretty clear what it is - that space could be used to separate the hide and delete buttons.

You might try eliminating the word and having the hide button on the left (it seems comments always open anchored at the top left) and a delete button on the right. I would recommend changing the x (maybe make it red or a garbage can?) to make it more clearly signify 'delete.'