Creatign receive handler for a custom adapter

Hi All,

I have two hosts created for my BizTalk.  One of them is the In-process
and 
the other one is Isolated.  I have also created a custom adapter that is 
both - send and receive - adapter.

I am trying to create handlers for my send and receive adapter. 
Basically, 
I am able to select the In-process host for my send adapter.  But for my 
receive adapter handler, the in-process host is not available as a choice
in 
my drop down box.  Only the isolated adapter is available as a choice.

Have I missed some configuration on the host?  I see many other out-of-box

adapters such as FILE that have the in-process host for send and receive 
handlers.

Any ideas?

Thanks.