@Uli: Oh, don't take it the wrong way; it works great and looks good. It just feels slightly less 10.5 than QuickPick/THCanvasView -- that's possibly partly because of the very os8-esque square icons and gray background in your demo app that comes to my mind whenever I think of the class :P

Although the solid dragging of icons feels wonky when used to ghost dragging in Finder.