title: Smart GWT: Combobox Item pick list issue
body: <p>I am using Start GWT 2.5. I am using combobox item. While opening a pick list and if pick list is having only one option, it shows horizontal and vertical scrollbars. Image is attached representing the issue.</p>
  
  <p><br><b>Code:</b></p>
  
  <pre><code>DynamicForm form = new DynamicForm();
  form.setIsGroup(true);
  form.setCellPadding(5);
  form.setNumCols(2);
  
  ComboBoxItem comboBoxItem = new ComboBoxItem("TestCombo");
  comboBoxItem.setValueMap("test1");
  form.setFields(comboBoxItem);
  form.draw();
  </code></pre>
  
  <p>Can any one help me?<img src="https://i.stack.imgur.com/U9Rll.png" alt="enter image description here"></p>