How to create a class pool

Hi how to create a class pool when i tried to create it has shown the following error
<b>Unable to change program from or to type K
Message no. DS165
Diagnosis
You tried to assign a type to a program that cannot be assigned in the program attributes, but can only be set internally by one of the tools in the ABAP Workbench.
The following program types are reserved:
F Reserved for Function Groups
Function groups are adminstered by the Function Builder, and you can only create or delete them using the Function Builder or the Object Navigator (Transaction SE80).
K Reserved for Class Defintions
Class definitions are administered in the Class Builder. You can only create or delete them using the Clas Builder or the Object Navigator.
J Reserved for Interface Definitions
Interface definitions are administered in the Clas Builder. You can only create or delete them using the class Builder or the Object Navigator.</b>

Hi,
Though you get a popup for different options for different program types like Class pools, function groups etc in SE 38 Program attributes, you can't create them from Se38 transaction.
They have to be created from different places.
Class Pools are nothing but creating CLASSes and INTERFACEs using the T Code SE24.
This needs little Java/OOPs concepts to create and use them.
Hope this helps.
Regards,
Anji

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