title: Criteria for displaying value on TextItem
body: <p>When I select value from dropdown then other textitem should be updated.
  Below is code for that:</p>
  
  <pre><code>SelectItem  courseItem = new SelectItem ("course.id", "Course");
  courseItem.setOptionDataSource(CoursesDS.getInstance());
  
  courseItem.setDisplayField("course.title");
  courseItem.addChangeHandler(new ChangeHandler() {
  
              @Override
              public void onChange(ChangeEvent event) {
                  c.addCriteria("course.id", (Integer)event.getValue());
                  CourseDS.getInstance().fetchData(c);
              }
          });
  
  TextItem courseNameItem = new TextItem("course.title", "Course Name");
  courseNameItem.setShowDisabled(false);
  </code></pre>
  
  <p>If i pass course id using criteria from selectitem then course name should automatically displayed in textitem but its not displaying.</p>
  
  <p>please suggest where am i wrong?</p>