WSForm.UserControl.registerListener method
Description
Use WSForm.UserControl.registerListener to register a function to receive
            messages from a server-side assembly, through the QueueClientResponse method. This
            method is similar to the WSUserControl.registerCallback method in
            previous versions.
Syntax
WSForm.UserControl.registerListener(callbackFn,
               scope)
Parameters
This table describes the method parameters.
| Name | Type | Description | 
|---|---|---|
| callbackFn | Function | Specify this function to call when server-side assembly messages are received. | 
| scope | Object | Optionally, specify the value of “this” used when the callbackFn function is executed. |