title: gwt pushButton in UiBinder
body: <p>I need to create a pushButton(so it's a button with image) in <code>gwt</code> with <code>UiBinder</code>, but I'm not sure how proceed. Here is my <code>ui.xml</code> code:</p>
  
  <pre>
  &lt;g:PushButton ui:field="myPushButton"/&gt;
  </pre>
  
  <p>And in *.java file I defined: <br/>
  <code>PushButton myPushButton;</code></p>
  
  <p>How can I add an image to the push button? I've tried the following but won't work:</p>
  
  <pre>
  &lt;g:PushButton ui:field="myPushButton" image="myImage.gif" /&gt;
  </pre>
  
  <p>Thanks</p>