I did some trials with a gridsplitter (inside grid) as an adorner. Somehow I did not manage to bind the GridColumnDefinition.WidthProperty succesful, but surely this should be possible. But as soon I had it in prototype I realized how good the slider was I already had, it supports snap to values. This suits the needs very good, so I try now to have a custom skin/theme on the slider in order to look a little nicer. Thanks anyway and cheers, Christoph
