public void showAtts() {
    if (ds == null) return;
    if (attTable == null) {
      // global attributes
      attTable =
          new BeanTableSorted(
              AttributeBean.class, (PreferencesExt) prefs.node("AttributeBeans"), false);
      PopupMenu varPopup = new ucar.nc2.ui.widget.PopupMenu(attTable.getJTable(), "Options");
      varPopup.addAction(
          "Show Attribute",
          new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
              AttributeBean bean = (AttributeBean) attTable.getSelectedBean();
              if (bean != null) {
                infoTA.setText(bean.att.toString());
                infoTA.gotoTop();
                infoWindow.show();
              }
            }
          });
      attWindow =
          new IndependentWindow("Global Attributes", BAMutil.getImage("netcdfUI"), attTable);
      attWindow.setBounds(
          (Rectangle) prefs.getBean("AttWindowBounds", new Rectangle(300, 100, 500, 800)));
    }

    List<AttributeBean> attlist = new ArrayList<AttributeBean>();
    for (Attribute att : ds.getGlobalAttributes()) {
      attlist.add(new AttributeBean(att));
    }
    attTable.setBeans(attlist);
    attWindow.show();
  }
    NestedTable(int level) {
      this.level = level;
      myPrefs = (PreferencesExt) prefs.node("NestedTable" + level);

      table = new BeanTableSorted(VariableBean.class, myPrefs, false);

      JTable jtable = table.getJTable();
      PopupMenu csPopup = new PopupMenu(jtable, "Options");
      csPopup.addAction(
          "Show Declaration",
          new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
              showDeclaration(table, false);
            }
          });
      csPopup.addAction(
          "Show NcML",
          new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
              showDeclaration(table, true);
            }
          });
      csPopup.addAction(
          "NCdump Data",
          "Dump",
          new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
              dumpData(table);
            }
          });
      if (level == 0) {
        csPopup.addAction(
            "Data Table",
            new AbstractAction() {
              public void actionPerformed(ActionEvent e) {
                dataTable(table);
              }
            });
      }

      // get selected variable, see if its a structure
      table.addListSelectionListener(
          new ListSelectionListener() {
            public void valueChanged(ListSelectionEvent e) {
              Variable v = getCurrentVariable(table);
              if ((v != null) && (v instanceof Structure)) {
                hideNestedTable(NestedTable.this.level + 2);
                setNestedTable(NestedTable.this.level + 1, (Structure) v);

              } else {
                hideNestedTable(NestedTable.this.level + 1);
              }
              if (eventsOK) datasetTree.setSelected(v);
            }
          });

      // layout
      if (currentComponent == null) {
        currentComponent = table;
        tablePanel.add(currentComponent, BorderLayout.CENTER);
        isShowing = true;

      } else {
        split = new JSplitPane(JSplitPane.VERTICAL_SPLIT, false, currentComponent, table);
        splitPos = myPrefs.getInt("splitPos" + level, 500);
        if (splitPos > 0) split.setDividerLocation(splitPos);

        show();
      }
    }