tree = toolkit.createTree(composite, SWT.MULTI | SWT.FULL_SELECTION | SWT.BORDER);
viewer = new TreeViewer(tree);
viewer.setContentProvider(new ImportTreeContentProvider());
viewer.setSorter(new ImportsAndExportsViewerSorter());
viewer.setLabelProvider(new ImportsExportsTreeLabelProvider());
hideSelfImportsFilter = new ViewerFilter() {
@Override
public boolean select(Viewer viewer, Object parentElement, Object element) {