Index: Classes/BackendUserInterface/class.tx_workspaces_pagetree_collectionsprocessor.php
===================================================================
--- Classes/BackendUserInterface/class.tx_workspaces_pagetree_collectionsprocessor.php	(revision 0)
+++ Classes/BackendUserInterface/class.tx_workspaces_pagetree_collectionsprocessor.php	(revision 0)
@@ -0,0 +1,94 @@
+<?php
+/***************************************************************
+ *  Copyright notice
+ *
+ *  (c) 2011 Tolleiv Nietsch <typo3@tolleiv.de>
+ *  All rights reserved
+ *
+ *  This script is part of the TYPO3 project. The TYPO3 project is
+ *  free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  The GNU General Public License can be found at
+ *  http://www.gnu.org/copyleft/gpl.html.
+ *  A copy is found in the textfile GPL.txt and important notices to the license
+ *  from the author is found in LICENSE.txt distributed with these scripts.
+ *
+ *
+ *  This script is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
+/**
+ * Interface for classes which perform pre or post processing
+ *
+ * @author Tolleiv Nietsch <typo3@tolleiv.de>
+ * @package	TYPO3
+ * @subpackage t3lib
+ */
+class tx_workspaces_pagetree_CollectionsProcessor implements t3lib_tree_pagetree_interfaces_CollectionProcessor {
+
+	/**
+	 * @abstract
+	 * @param  t3lib_tree_pagetree_Node $node
+	 * @param  int $mountPoint
+	 * @param  int $level
+	 * @param  t3lib_tree_pagetree_NodeCollection $nodeCollection
+	 * @return void
+	 */
+	public function postProcessGetNodes($node, $mountPoint, $level, $nodeCollection) {
+		foreach($nodeCollection as $node) {
+			/** @var $node t3lib_tree_Node */
+			$this->highlighVersionizedElements($node);
+		}
+	}
+
+	/**
+	 * @abstract
+	 * @param  t3lib_tree_pagetree_Node $node
+	 * @param  string $searchFilter
+	 * @param  int $mountPoint
+	 * @param  t3lib_tree_pagetree_NodeCollection $nodeCollection
+	 * @return void
+	 */
+	public function postProcessFilteredNodes($node, $searchFilter, $mountPoint, $nodeCollection) {
+		foreach($nodeCollection as $node) {
+			/** @var $node t3lib_tree_Node */
+			$this->highlighVersionizedElements($node);
+		}
+	}
+
+	/**
+	 * @abstract
+	 * @param  string $searchFilter
+	 * @param  t3lib_tree_pagetree_NodeCollection $nodeCollection
+	 * @return void
+	 */
+	public function postProcessGetTreeMounts($searchFilter, $nodeCollection) {
+		foreach($nodeCollection as $node) {
+			/** @var $node t3lib_tree_Node */
+			$this->highlighVersionizedElements($node);
+		}
+	}
+
+	/**
+	 * Set's the CSS Class on all pages which have versioned records
+	 * in the current workspace
+	 *
+	 * @param t3lib_tree_Node $node
+	 * @return void
+	 */
+	protected function highlighVersionizedElements(t3lib_tree_Node $node) {
+		if (!$node->getCls() && count(t3lib_BEfunc::countVersionsOfRecordsOnPage($GLOBALS['BE_USER']->workspace, $node->getId(), TRUE)))	{
+			$node->setCls('ver-versions');
+		}
+	}
+}
+
+?>
\ No newline at end of file
Index: ext_localconf.php
===================================================================
--- ext_localconf.php	(revision 4171)
+++ ext_localconf.php	(working copy)
@@ -32,6 +32,8 @@
 	);
 }
 
+$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/tree/pagetree/class.t3lib_tree_pagetree_dataprovider.php']['postProcessCollections'] = 'EXT:workspaces/Classes/BackendUserInterface/class.tx_workspaces_pagetree_collectionsprocessor.php:tx_workspaces_pagetree_collectionsprocessor';
+
 t3lib_extMgm::addUserTSConfig('options.workspaces.considerReferences = 1');
 
 ?>
\ No newline at end of file