CHEM_Eugene, that is a problem with sizing the example. BorderLayoutContainer requires a size to work correctly. When that example runs in the explorer app, it is given a size, but there is a bug in the onModuleLoad method. In that method you should either wrap it up in a Viewport, or give it a size. This same issue would occur with the *non* uibinder version, so it isn't a uibinder bug, but that the non-uibinder version is correctly using a viewport in its onModuleLoad.

Here is an onModuleLoad that fixes that sample:
  public void onModuleLoad() {
    Viewport vp = new Viewport();