import com.haulmont.cuba.gui.components.AbstractWindow; //导入依赖的package包/类
protected Frame wrapByCustomClass(Frame frame) {
    String screenClass = element.attributeValue("class");
    if (StringUtils.isBlank(screenClass)) {
        screenClass = AbstractFrame.class.getName();
    }

    Class<?> aClass = scripting.loadClass(screenClass);
    if (aClass == null) {
        aClass = ReflectionHelper.getClass(screenClass);
    }
    if (aClass == null) {
        throw new GuiDevelopmentException("Unable to load controller class", frame.getId());
    }

    if (AbstractWindow.class.isAssignableFrom(aClass)) {
        LoggerFactory.getLogger(FrameLoader.class).warn(
                "Frame class '{}' should not be inherited from AbstractWindow. " +
                        "It may cause problems with controller life cycle. " +
                        "Frame controllers should inherit AbstractFrame.",
                aClass.getSimpleName());
    }

    return ((WrappedFrame) frame).wrapBy(aClass);
}