IWorkbenchWindow window = HandlerUtil.getActiveWorkbenchWindow(event);
IWorkbenchPage page = window.getActivePage();
ILogViewEditor editor =
(ILogViewEditor) page.getActiveEditor().getAdapter(ILogViewEditor.class);
if (editor != null) {
editor.previousPage();
// Request re-evaluation
IEvaluationService service =
(IEvaluationService) window.getService(IEvaluationService.class);
service.requestEvaluation("net.sf.logsaw.ui.expressions.logViewEditor.isPreviousPageAllowed"); //$NON-NLS-1$