sets the active skin
| skin | string | the name of the skin. The allowed values are: "terrace", "dark", "material", "flat", "contrast-white", "contrast-black" |
scheduler.setSkin("flat");
If the method is called after a scheduler is initialized, it will trigger the render method.
If called before initialization, the method will have the same effect as the assignment of the scheduler.skin property:
scheduler.skin = "flat";