Implement the callback interfaces

1. Add an implementation for each chat server extensibility interface you will support. For example:

   Implements IChatExtensionCallBack
   Implements IChatUserCallBack
   

2. Add empty declarations for every callback method. You can do this easily by selecting the interface name in the Object drop-down, and then selecting each method individually from the Procedure drop-down.

Note: All interface methods must be defined, but should be empty if they are not required. Empty procedures will automatically return a "Not implemented" (E_NOTIMPL) error if they are invoked by the chat service.

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