/** Set a particular column to be visible (or not).
	    @param column The (physical) column to act on
	    @param on True iff the column should be shown
	*/
	public void setVisible(int column, boolean on) {
	    if (visible[column] == on) {
		return; // Already so - nothing to do
	    }
	    visible[column] = on;
	}

	/** Recompute the visible columns and update table */
	public void recomputeVisibleColumns() {
	    // Recompute visible maps
	    numVisible = 0;
	    for (int i = 0; i < numCols; i++) {
		if (visible[i]) {
		    visibleColumns[numVisible] = i;
		    numVisible++;
		}
	    }

	    //System.out.println("updated numVisible to " + numVisible + "  - id is " + myid);
	    
	    // firstTableStructureChanged() seems to remove the selection
	    // However, we want to preserve the selection across this
	    // operation
	    int keepSelection = selectedRow; // XXX won't work for multiple selection
	    
	    fireTableStructureChanged(); // Consider using TableModelEvent
	    // instead so I can indicate insertion vs deletion etc.
	    setupCellEditors();
	    setupCellRenderers();
	    resizeColumns();
	    
	    selectedRow = keepSelection; // restore selection
	    
	    // Restore selection
	    if (selectedRow != -1) {
		ignoreSelection = true;
		table.changeSelection(selectedRow, 0, false, false);
		ignoreSelection = false;
	    }
	}

	/** @return True iff the given physical column is visible */
	public boolean getColumnVisible(int col) {
	    return visible[col];
	}

	/** Edit the visible table columns */
	public void selectVisibleColumns(DebuggerTableWindow sourceWindow) {
	    
	    JPanel panel = new javax.swing.JPanel();	
	    panel.setLayout(new GridBagLayout());
	    
	    ArrayList boxes = new ArrayList(numCols);
	    GridBagConstraints gridBagConstraints = new GridBagConstraints();
	    gridBagConstraints.gridwidth = java.awt.GridBagConstraints.REMAINDER;
	    gridBagConstraints.anchor = java.awt.GridBagConstraints.WEST;
	    gridBagConstraints.insets = new java.awt.Insets(0, 12, 0, 12);
	    GridBagConstraints firstConstraints = new GridBagConstraints();
	    firstConstraints.gridwidth = java.awt.GridBagConstraints.REMAINDER;
	    firstConstraints.anchor = java.awt.GridBagConstraints.WEST;
	    firstConstraints.insets = new java.awt.Insets(12, 12, 0, 12);
	    
	    for (int i = 0; i < numCols; i++) {
		// XXX Use formatting class (MessageFormat) !
		JCheckBox b = new JCheckBox(
		    MessageFormat.format(IpeDebugger.getText(
					     "VisColsDesc"), // NOI18N
					 new String[] { columnNames[i],
							columnHelp[i] }),
		    visible[i]);
		if (i == 0) {
		    panel.add(b, firstConstraints);
		} else {
		    panel.add(b, gridBagConstraints);
		}
		boxes.add(b);
		// This is kinda silly but we've already baked a fully description
		// into the label so it's not necessary here.
		b.getAccessibleContext().setAccessibleDescription(columnHelp[i]);
	    }

	    String title = MessageFormat.format(
			IpeDebugger.getText("TableColumnsHeader"),  // NOI18N
			new String[] { sourceWindow.getName() });

	    DialogDescriptor dlg = new DialogDescriptor(
		panel,
		title,
		true,
		DialogDescriptor.OK_CANCEL_OPTION,
		DialogDescriptor.OK_OPTION,
		DialogDescriptor.DEFAULT_ALIGN, // DialogDescriptor.BOTTOM_ALIGN,
		null, // get topic! new HelpCtx("Debugging_configure"), // NOI18N
		null);

	    final Dialog dialog = TopManager.getDefault().createDialog(dlg);
	    dialog.show();
	    
	    if (dlg.getValue().equals(DialogDescriptor.OK_OPTION)) {	
		//  UsageTracking.sendEvent(evt);
		int num = boxes.size();
		int nv = 0;
		for (int i = 0; i < num; i++) {
		    JCheckBox b = (JCheckBox)boxes.get(i);
		    visible[i] = b.isSelected();
		    if (visible[i]) {
			nv++;
		    }
		}
		// Don't allow the user to disable ALL columns
		if (nv == 0) {
		    visible[0] = true;
		}
		recomputeVisibleColumns();
		if (UsageTracking.enabled)
		    UsageTracking.sendAction("RunConfigDialog: OK", null); // NOI18N
	    } // else Cancel or Esc
	}