The TCallbackClientScript class provides corresponding methods that can be
executed on the client-side (i.e. the browser client that is viewing
the page) during a callback response.
For a complete list of available client side methods, consult the
The available methods includes setting/clicking input elements, changing Css
styles, hiding/showing elements, and adding visual effects to elements on the
page. The client-side methods can be access through the CallbackClient
property available in TPage.
For example, to hide "$myTextBox" element during callback response, do: