I have a Ext Designer 1.1.2 ExtJS 3 project that I upgraded using the 1.2.1 beta. I ran into a problem with the TreePanel. I have a TreePanel that I promoted to a class in 1.1.2. The problem is that in 1.2.1, I am unable to see any of the nodes in the tree (both in the designer as well as in the browser). Finally, I discovered that the Ext Designer 1.2.1 did not migrate the TreePanel definitions properly.
Here is an example of the 1.1.2 tree node definition in the xds: