@Override public void initialize(ISynchronizePageConfiguration configuration) { super.initialize(configuration); final Viewer viewer = configuration.getPage().getViewer(); if (viewer instanceof AbstractTreeViewer) { expandAllAction = new ExpandAllAction((AbstractTreeViewer) viewer); Utils.initAction(expandAllAction, "action.expandAll."); // $NON-NLS-1$ collapseAll = new Action() { @Override public void run() { if (viewer.getControl().isDisposed() || !(viewer instanceof AbstractTreeViewer)) return; viewer.getControl().setRedraw(false); ((AbstractTreeViewer) viewer) .collapseToLevel(viewer.getInput(), AbstractTreeViewer.ALL_LEVELS); viewer.getControl().setRedraw(true); } }; Utils.initAction(collapseAll, "action.collapseAll."); // $NON-NLS-1$ ICompareNavigator nav = (ICompareNavigator) configuration.getProperty(SynchronizePageConfiguration.P_NAVIGATOR); if (nav != null) { gotoNext = new NavigateAction(configuration, true /*next*/); gotoPrevious = new NavigateAction(configuration, false /*previous*/); } } }