public void itemReleased(VisualItem item, MouseEvent e) {
if (!SwingUtilities.isLeftMouseButton(e)) return;
if (dragged) {
activeItem = null;
item.setFixed(wasFixed);
dragged = false;
}
// clear the focus
Visualization vis = item.getVisualization();
vis.getFocusGroup(Visualization.FOCUS_ITEMS).clear();
vis.cancel("forces");
}
