VB scripting is no longer supported.  You could write a component externally using VB.Net, however.

There isn't really an example we could provide since the component is your own code. Just be sure it is of the Type Component. Once you write your component, place it in the installation directory of Studio. On the Toolbox window in Studio, you can right-click and select your component from here and add it to your Toolbox to be added to your automation/global container/etc.... All of your public properties, methods, and events should be available in the Object Explorer window to use like any other component (StringUtils, CredentialStore, etc...).