protected Composite createMaxOccurComp(Composite parent, FormToolkit toolkit) {
    fMaxLabel = toolkit.createLabel(parent, PDEUIMessages.AbstractSchemaDetails_maxOccurLabel);
    fMaxLabel.setForeground(toolkit.getColors().getColor(IFormColors.TITLE));
    Composite comp = toolkit.createComposite(parent);
    GridData gd = new GridData(GridData.FILL_HORIZONTAL);
    gd.horizontalSpan = 2;
    GridLayout layout = new GridLayout(3, false);
    layout.marginHeight = layout.marginWidth = 0;
    comp.setLayout(layout);
    comp.setLayoutData(gd);

    fMaxOccurSpinner = new Spinner(comp, SWT.BORDER);
    fMaxOccurSpinner.setMinimum(1);
    fMaxOccurSpinner.setMaximum(999);
    fMaxOccurSpinner.setIncrement(1);

    fUnboundSelect =
        toolkit.createButton(comp, PDEUIMessages.AbstractSchemaDetails_unboundedButton, SWT.CHECK);
    gd = new GridData();
    gd.horizontalIndent = 10;
    fUnboundSelect.setLayoutData(gd);
    fUnboundSelect.addSelectionListener(
        new SelectionAdapter() {
          @Override
          public void widgetSelected(SelectionEvent e) {
            if (blockListeners()) return;
            fMaxOccurSpinner.setEnabled(!fUnboundSelect.getSelection() && isEditableElement());
          }
        });

    return comp;
  }
 protected void hookMaxOccur(SelectionAdapter adapter) {
   fUnboundSelect.addSelectionListener(adapter);
   fMaxOccurSpinner.addSelectionListener(adapter);
   fMaxOccurSpinner.addModifyListener(
       new ModifyListener() {
         @Override
         public void modifyText(ModifyEvent e) {
           if (blockListeners()) return;
           int maxValue = fMaxOccurSpinner.getSelection();
           if (maxValue < getMinOccur()) fMaxOccurSpinner.setSelection(maxValue + 1);
         }
       });
 }