svn changeset:19386/svn branch:6.6
<li><tt>CheckBox</tt> now supports null values, displayed as false (<a href="http://dev.vaadin.com/ticket/6918">#6918</a>)</li>
<li>The method <tt>Button.fireClick(MouseEventDetails)</tt> is used by Button instead of <tt>Button.fireClick()</tt>. Subclasses should override the former and not the latter.</li>
<li>The 'liferay' theme is included in Vaadin core starting from version 6.6.2. Themes still need to be copied to the shared resource directory in a Liferay installation when upgrading Vaadin.</li>
+ <li>MenuBar supports checkable items (on/off) starting from version 6.6.2.</li>
</ul>
<p>In the client-side API:</p>