Fix a freeze that occurs when you move or delete a file in the
file manager
Make file sort buttons work again
Change-Id: Ifcb68edf3c29c475946d538748729485d0840842
Sometimes a var change event came in while the file selector was
being rendered. Changes to the mFolderList or mFileList vectors
sometimes resulted in a crash. This patch set moves the
GetFileList call to the Render function to prevent the vectors
from changing while the render is taking place.