When attempting to traverse the page through tabs, the keyboard navigation freezes on the 'add files' button. This only occurs after the uploader has opened in the pop-up version.

steps to reproduce:

1) Open the pop-up version of uploader from the daily build site
http://build.fluidproject.org/fluid/sample-code/uploader/pop-up/index.html

2) select "add files"

3) close the os file open dialog

4) tap the 'tab' key. Notice that after it cycles through the elements of the uploader and the browser, it comes back and freezes on "add files"

dev-iteration39