I brought this issue up in this topic here; http://newsgroup.xnview.com/viewtopic.php?f=60&t=19702 and I said this:
Currently in the toolbar editor (MP win 0.25), when I click on any item the side scroll auto shifts to the right which does not seem correct. I think this is a bug but I was unsure about reporting it in the 'mp bugs' forum section. I snapped a picture to show; http://i44.tinypic.com/riezhg.png
