title: Showing ExpandItem slowly
body: <p>I am using SWT <code>ExpandBar</code> in my application. Now I have got one requirement that when I click
  the <code>ExpandBar</code>, I wanted to show the item in a very slower manner. </p>
  
  <p>That means some kind of
  animation to the expand bar. Similar to jQuery. Currently when I click the <code>ExpandBar</code>, immediately it shows the contents which is the
  default behaviour. Is it possible?</p>