I have a web-desktop application with GXT 2.0.1 and GWT 1.6.4. I customized some GXT classes, like Desktop and TaskBar, as my app needs some additional functionalities. Right now, I need to upgrade my app to GXT 2.1 and GWT 2. When I tried, everthind did work fine, except the StartMenu. It just doesn't appear. I click the button and nothing happens. Do you have any clues about what maybe is happening?