If you create a ScrollPane with a fully visible content, it still consumes scroll events and actually performs some scrolling, although nothing moves. Unfortunately this affects all samples in Ensemble. The problem is easiest to see on MouseEventSample - scrolling does nothing for a while (events are consumed by a parent ScrollPane) and then it suddenly starts affecting the demo (when the ScrollPane is "scrolled" to the maximum value). When you change scrolling direction, some events are again consumed by the ScrollPane.