Why do you feel you need to use custom VB scripts? We've noticed that sometimes our customer tend to do that when there's no real reason. Please see this article
for more information.
If you really need to do this in code, Test Studio supports coded steps
(i.e. scripted steps as part of your test). We currently support C# and VB as a scripting language so you can add VB or C# scripts directly in your Test Studio tests.
You can also use Visual Studio to create a DLL
that contains coded methods (not tests) that can be called from the coded steps of your tests.
the Telerik team