glassPane.setPoint(p);
glassPane.setVisible(false);
glassPane.setImage(null);
fireGhostDropEvent(new GhostDropEvent(dragStart, eventPoint, dragTracks));
if (selectedGroup != null) {
int idx = getGroupGapNumber(e.getY());
TrackPanel dataTrackView = (TrackPanel) getParent();
dataTrackView.moveGroup(selectedGroup, idx);