Problem getting BuildServerAdapter plugin working

Hello,

I am trying to create a plugin that extends BuildServerAdapter, just like the provided sample code for the logging listener.

My code looks like this:
public class TeamCityX10Listener extends BuildServerAdapter {


    private static final Logger log = Logger.getInstance(TeamCityX10Listener.class.getName());

    private CM17ASerialController controller;
    private final SBuildServer myBuildServer;

    public TeamCityX10Listener(SBuildServer sBuildServer) {

        this.myBuildServer = sBuildServer;
    }

    public void register(){
        System.out.println("Registering TeamCityX10Listener");
        myBuildServer.addListener(this);
    }

    private void sendCommand(byte command) {
          //sends X10 command, code removed
    }

// bunch of code removed

    public void buildStarted(SRunningBuild sRunningBuild) {
        System.out.println("Sending buildStarted message");
        sendCommand(Command.ON);
    }

// bunch of code removed
}

The code is packaged into a zip file with the structure:
X10Notifier.zip
  -> server
          comm.jar (support jar file)
          x10.jar (support jar file)
          x10Notifier.jar
  teamcity-plugin.xml

I put this file into my TeamCity data directory and when I start the TeamCity Web Server service, it gets unpacked into /plugins/.unpacked and looking in the TeamCity server log file, I can see that the plugin is correctly registered.

However, when I run a build, nothing happens! I know that this code works, but I do not know why the plugin doesnt seem to be working. I was able to get this code running when I was extending the Notifer class, like tcGrowl does, the X10 commands worked with no problems when a build was run.

When the plugin is set up as a BuildServerAdapter, as I think it should be (because this is not a per user notification that I want), nothing appears to be running. I have some System.out.println statements in the classes methods so I could at least check if the plugin is being registered or if the events in the class are firing, but nothing is being written anywhere.

Please help,
Jeff