Java Code:
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;

public class Snippet80 {

  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final Tree tree = new Tree(shell, SWT.BORDER | SWT.MULTI);
    for (int i = 0; i < 2; i++) {
      TreeItem item = new TreeItem(tree, SWT.NONE);
      item.setText("item " + i);
      for (int j = 0; j < 2; j++) {
        TreeItem subItem = new TreeItem(item, SWT.NONE);
        subItem.setText("item " + j);
        for (int k = 0; k < 2; k++) {
          TreeItem subsubItem = new TreeItem(subItem, SWT.NONE);
          subsubItem.setText("item " + k);
        }
      }
    }

    tree.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        TreeItem[] selection = tree.getSelection();
        TreeItem[] revisedSelection = new TreeItem[0];
        for (int i = 0; i < selection.length; i++) {
          String text = selection[i].getText();
          if (text.indexOf("1") > 0) {
            TreeItem[] newSelection = new TreeItem[revisedSelection.length + 1];
            System.arraycopy(revisedSelection, 0, newSelection, 0,
                revisedSelection.length);
            newSelection[revisedSelection.length] = selection[i];
            revisedSelection = newSelection;
          }
        }
        tree.setSelection(revisedSelection);
      }
    });

    shell.setSize(300, 300);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}