public SchedulerForm openDirectory(String filename) {
SchedulerForm scheduler = new SchedulerForm(this, folder, SWT.NONE, SchedulerDom.DIRECTORY);
if (scheduler.openDirectory(filename, filelist)) {
CTabItem tab = newItem(scheduler, scheduler.getFilename());
tab.setImage(ResourceManager.getImageFromResource("/sos/scheduler/editor/editor-small.png"));
return scheduler;
} else
return null;