Areca Backup

I don't know if this is really a bug report or feature request, but from a
GUI point of view, it feels like a bug.

At the end of a "Backup Simulation", Areca shows a list (grid) with all
the files (and respective file sizes) it will back up. The grid has two
headers, "File" and "Size". I expected that clicking the "Size" header
would sort the files by size, but nothing happens when I click it.

This feature would help users find files they might want to filter out of
the backup, reducing backup time and saving space on the backup media.

I'm using Areca 7.1.5 on a Windows XP Professional (SP3) and Java SE build
1.6.0_15-b03.