===== Visual =====
All visible ui elements on the devices, include three types: Hud UI, Holder(Panel), and Components which must belong to a Holder. 
  * Holder（Combined with lots of components）
    * Component
        * Nonaction
        - UITxt
        - UIProg
        - UISonItem
        - UISonGeneral
        - UIScrollFixed
        - UILocker
        - UILst
        - UILst_Mid
        - UILst_Irreg
        * Action
        - UIButton
        - UIGroup
        - UIIpt
        - UISlider
        - UITogl
        - UIRImg
        - UILoopRoll
  * Hud