BRFplus: How to create an instance of User-Defined Expression Type?

Hi,
  I've created an expression type in a System Application and marked its Access Level as Global. I've created a Class & Interface and assigned it to my Expression Type, and activated it successfully.
Now how do use this Expression Type to create expression in my Customizing Applications?
Do I have to make any more code changes like extending any more classes or implementing additional interfaces? (I've already created a dummy Query Class and UI class)
Any documentation or example of how to create a user-defined Expression Type and how to use them will be very helpful for me.
Thank you & Best Regards

Well I was going through the PDF documents available on SDN. I came across a document which referred to a document on creating user-defined expression.
Document Name: [BRFplus XML Export and Import|http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/20462066-a086-2d10-a999-c9075767ce48?quicklink=index&overridelayout=true].
The code sample for creating user-defined expression types is available in the How to Create Custom Expression Types document
Pg. 24
I had a hard time looking for that document. Couldn't find it though.
Thank you Mr. Ziegler, now I know that currently there isn't any documentation on User-Defined Expression Types. I'll be awaiting for your  document on this
Any overview about the steps to be followed in creating a custom expression type, with a few simple steps on how to do it over here would be greatly appreciated. Especially on how to get it seen in the Create Expression Sub-Menu. Also do I have to code a web dynpro for the UI?
Thank you & Best Regards.

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