update

README.md

     // e.g. setState(() => {....})
 }
 ```
-All the code dealing with UIWidgets (```setState()``` in most case) needs to be in window scope.
-For callback/event handler methods from UIWidgets (e.g ```Widget.build, State.initState...```), you don't need put them
-in the window scope. 
+For callback/event handler methods from UIWidgets (e.g ```Widget.build, State.initState...```), you don't need do
+it yourself, since the framework ensure it's in window scope. 
 ## Debug UIWidgets Application
 
 #### Define UIWidgets_DEBUG