1. In CameraBackgroundSkyBoxBrush _actived and _textureValid should set true as default, otherwise will cause user get wrong display status.
2. "Enable Wrap" check box in "31:Node: Label - New API -> 55:Resize content Test" is not used, so set it to disabled, won't let user to change it.
3. When set blank texture to UISlider or UISlider button, use resetRender function to clear texture, use init with blank file name will cause error.