changing emitter type dynamically, possible?

Hi there, I'm using Spark (and loving it so far), and I had a question. I'm trying to implement a system that creates one emitter object, which feeds into a group. I want to be able to change the emitter type dynamically. In my class, I have something like this:

Emitter* pointerToCurrentEmitterObject;
pointerToCurrentEmitterObject = SphericalEmitter::Create(...);

and the Group class adds this pointer later. Now, at some point, I want to change this to a Straight emitter:

Emitter* tmpEmitter = pointerToCurrentEmitterObject;
pointerToCurrentEmitterObject = StraightEmitter::Create(...);

if (tmpEmitter) delete tmpEmitter;

However, what happens is that the Spherical emitter stops, and the Striaght emitter doesn't work. I'm guessing that something underneath needs updating. Any thoughts on how I could do this?

cheers.

Well, you are just changing a pointer - this cannot work like this.

The best approach is:
- remove emitter from group
- (optional) delete it
- add the new emitter to the group

Also, I'm finalizing a part of SPARK 2.0, where such tasks will be a lot more easier to do (controls & attributes)