title: set height of button in spark ButtonBar flex4
body: <p>i have the following code:</p>
  
  <pre><code>        &lt;s:ButtonBar id="tabs" y="15" left="0" height="31"
                   change="VideosMenuBar_changeHandler(event)" requireSelection="true"&gt;  
          &lt;s:layout&gt;
              &lt;s:HorizontalLayout gap="1" columnWidth="180" variableColumnWidth="false"   
                                  /&gt;
          &lt;/s:layout&gt;
  
          &lt;s:ArrayCollection&gt;
              &lt;fx:String&gt;Latest Videos&lt;/fx:String&gt;
              &lt;fx:String&gt;Last Week Videos&lt;/fx:String&gt;
              &lt;fx:String&gt;Last Month Videos&lt;/fx:String&gt;
          &lt;/s:ArrayCollection&gt;
  
      &lt;/s:ButtonBar&gt;
  </code></pre>
  
  <p>how can i change the height of the buttons in this buttonbar?? is it possible without extra skin class??</p>