This change makes the modal box focusable by adding the 

attribute tabindex="0" to the element and calling focus on it 

when it is initialized. This allows views that have modalBox

as a parent to detect key events within it, such as RB.DialogView.

Manual verification that the modal box is focused when it is

created in the new review request dialog and the file upload

dialog. This is indicated by the focus ring around the dialogs

in the attached screenshots.