title: GWT UiBinder content assist seems to be missing
body: <p>I am not new to GWT &amp; UiBinder development, however it has been a long time since I have used Eclipse for this (I've been using Intellij IDEA the past months). </p>
  
  <p>I am now trying to get an efficient working environment for GWT under Eclipse 4.2, and struggling with the content assist for GWT UiBinder (.ui.xml files). </p>
  
  <p>It looks to me that the only thing that is required is that Google Plugin for Eclipse should be installed, which is:</p>
  
  <p><img src="https://i.stack.imgur.com/S5cby.png" alt="Screenshot showing the current installation of Google plugin for eclipse"></p>
  
  <p>And probably also that GWT SDK is enabled in the project configuration, which is. </p>
  
  <p>I am also having Maven and Spring on this project, don't know if that could be some content-assist clash. </p>
  
  <p>Anyhow, my problem is that I don't get the content-assist in the ui.xml files. 
  I get an error if I'm referencing a class widget that does not exist, but I don't get no auto-completion, nor errors for uiFields being declared in XML and not in JAVA (But i do get errors for UiFields being declared in Java and not in Xml). </p>
  
  <p>Any idea about what could be going wrong?</p>
  
  <p>PS: If I open a &lt; and then use CTRL+SPACE to fire auto-completion, I get the "<em>Content Assist not available at current location</em>" error message.</p>