void (final LwRootContainer rootContainer, final String classToBindName) { // 1. Prepare form to preview. We have to change container so that it has only one binding. rootContainer.setClassToBind(classToBindName); FormEditingUtil.iterate( rootContainer, new FormEditingUtil.ComponentVisitor<LwComponent>() { @Override public boolean visit(final LwComponent iComponent) { iComponent.setBinding(null); return true; } } ); if (rootContainer.getComponentCount() == 1) { ((LwComponent)rootContainer.getComponent(0)).setBinding(PREVIEW_BINDING_FIELD); } }