Flat file disassemblers again

Heya, I know I might be spamming the forum but I'm having some trouble with

Flat file disassemblers...

I've created an Orchestration that receives two different types of flat 
files on the same receive location. I added a receive pipeline and in the 
Disassemble stage I added two Flat file disassemblers and set their 
"Do***ent schema" property accordingly.

It works alright if the first Flat file disassembler recognizes the
incoming 
do***ent, but if it fail it does not pass it on to the next Flat file 
disassembler. It raises the error:
Unexpected data found while looking for:
';'

On msdn (http://msdn2.microsoft.com/en-us/library/ms966340.aspx)
it is 
stated that:
"So if you expect to receive different flat file do***ents on the same 
receive location, you typically include several flat file disassemblers in

the receive pipeline, one for each schema. At run time, the correct 
disassembler component is selected using a pipeline probing mechanism."
This 
is not working for me, the Probe method (or whatever) is throwing an 
exception.

What should I do? I'm not too happy about implementing my custom pipeline 
component.

Cheers,
Chris