Modifying the Robocode Game.

I'm trying to modify the robocode game for a University assignment and I'm currently stuck so if anyone could help me that would be greatly appreciated. To modify the game I decided to create a new robot type that freezes other robots for a certain amount of turns when it runs into them. I have created a new interface for the freeze robot and altered some of the other code. When the game starts up it goes through all the robots that the user can choose from and creates a RobotPeer for them. And for each RobotPeer they all have a RobotType. If I debug the game here I can check the FreezeRobot that I made that implements the interface and it shows that it has both type FreezeRobot and AdvancedRobot. Which is what I want because if it doesn't implement AdvancedRobot then it can't use any of AdvancedRobot methods. So up till here everything is fine.

Though when I select the FreezeRobot and start a game with it then debug to check the RobotPeer, it is now only an AdvancedRobot. Can someone explain why this is?

In case you are wondering, what I am trying to do is to make edit the RobotPeer code in the checkForRobotCollision method. After it creates a new HitRobotEvent and sends that to the robot, I want to check if the otherRobot is a FreezeRobot and in this case it will change some variable that makes the robot frozen. I haven't worked that part out yet but I need to be able to see if the otherRobot is a FreezeRobot first so hence this post.

If anyone has any advice/tips/help it would be greatly appreciated. Thanks