btStart = ComponentFactory.getButton(DcResources.getText("lblStart"), IconLibrary._icoAdd);
btStart.setActionCommand("readDir");
btStart.addActionListener(this);
ffSingle = filter != null ?
ComponentFactory.getFileField(false, false, new DcFileFilter(filter.getExtensions())) :
ComponentFactory.getFileField(false, false);
btAdd.setActionCommand("addFile");
btAdd.addActionListener(this);