I am using GWT 1.6.4 and the most recent version of GWT Designer (7.0).
This is a snippet from the entry point class generated by GWT's webAppCreator-script:
[...]
public void onModuleLoad() {
final Button sendButton = new Button("Send");
final TextBox nameField = new TextBox();
nameField.setText("GWT User");
[...]
For any reason these 2 widgets are not visualized when I go to the GWT Designer's Design tab (see screenshot).