com.smartgwt.client.docs

## Interface Callback

-     public interface Callback

  A `Callback` is an arbitrary action to be fired - usually passed into a method to be fired asynchronously as a notificaction of some event.
  The `callback` can be defined in the following formats:
  - a function
  - A string containing an expression to evaluate
  - An object with the following properties:
    - target: fire in the scope of this target - when the action fires, the target will be available as `this`.
    - methodName: if specified we'll check for a method on the target object with this name.
  `Callbacks` are fired via the Class.fireCallback method, which allows named parameters to be passed into the callback at runtime. If the Callback was specified as a string of script, these parameters are available as local variables at eval time.
  For specific Smart GWT methods that make use of `Callback` objects, see local documentation for information on parameters and scope.