need help reverting to default pane

Unknownhero1123_c57037eb13

somehow, in the content pane, I changed the file viewer from the tree view to this checkmark window and I can't revert it back. help?

 

http://imgur.com/pNT9T2i

fixmypcmike

There's a closed part of the pane between the content types checkboxes and the individual item icons -- click on the thicker part of the horizontal divider, just above where it says "1-1 of 1" to reopen it.

Unknownhero1123_c57037eb13

that worked, thanks!