字段是否干扰了Scala动态特征的方法解析？

trait BeanProperties extends Dynamic {
  def applyDynamic(name: String)(args: Any*) = {
    if (args.length == 0)
      PropertyUtils.getProperty(this, name)
    else
      null
  }
}

val bean = new JTextField(\"text\") with BeanProperties
bean.getText should equal(\"text\")
bean.text should equal(\"text\")

bean.background should equal(bean.getBackground)

variable background in class Component cannot be accessed in javax.swing.JTextField with BeanPropertiesTest.this.BeanProperties