protected void asyncReload(){
	Job job = Job.create(getJobName(), new ICoreRunnable() {
		@Override
		public void run(IProgressMonitor monitor) throws CoreException{
			loadedElements = getElements(null);
			Display.getDefault().asyncExec(() -> {
				// virtual table ...
				AbstractTableViewer viewer =
					(AbstractTableViewer) commonViewer.getViewerWidget();
				if (viewer != null && !viewer.getControl().isDisposed()) {
					viewer.setItemCount(loadedElements.length);
				}
				// trigger viewer refresh
				commonViewer.notify(Message.update);
			});
		}
	});
	job.setPriority(Job.SHORT);
	job.schedule();
}