Index: typo3/js/tree.js
===================================================================
--- typo3/js/tree.js	(revision 8049)
+++ typo3/js/tree.js	(working copy)
@@ -260,17 +260,25 @@
 	 */
 	filter: function() {
 		var searchString = $F(this.field).toLowerCase();
+		var isUID = !isNaN(searchString);
+		var pages = $$('#treeRoot .dragTitle a');
 
-		var pages = $$('#treeRoot .dragTitle a');
 		pages.each(function(el) {
-			if (el.innerHTML.toLowerCase().include(searchString)) {
-				el.up().removeClassName('not-found');
+			if (isUID) {
+				if (el.up().identify().indexOf(searchString) != -1) {
+					el.up().removeClassName('not-found');
+				} else {
+					el.up().addClassName('not-found');
+				}
 			} else {
-				el.up().addClassName('not-found');
+				if (el.innerHTML.toLowerCase().include(searchString)) {
+					el.up().removeClassName('not-found');
+				} else {
+					el.up().addClassName('not-found');
+				}
 			}
 		});
 		this.toggleReset();
-
 	},
 
 	/**