attached patch seems to solves the problem
--- qooxdoo-1.2.1-sdk-orig/framework/source/class/qx/data/controller/Tree.js 2010-07-14 09:06:18.000000000 +0200
+++ qooxdoo-1.2.1-sdk/framework/source/class/qx/data/controller/Tree.js 2010-11-08 20:44:09.000000000 +0100
@@ -611,8 +611,9 @@
{
// remove the old children listener
var children = model[childrenGetterName]();
var oldRef = this.__childrenRef[children.toHashCode()];
children.removeListenerById(oldRef.changeListenerId);
+ this.__removeAllFolders(treeFolder);
model.removeListenerById(oldRef.changeChildernListenerId);
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