Do you mean, you have one of these new-fangled stinky integrated IP projects in VS.NET, using managed code, having downloaded the new IP 2003 Toolkit for VS.NET? Which runs like a dog...
'Coz I've stuck to the separate IP project, nothing to do with VS.NET, using MS Script, and then I know how to do what you want...
For your way, have you tried just putting a breakpoint in the WS and see if the debugger picks it up? It probably doesn't... Otherwise, all I can think of is one of:
* can you run two instances of VS.NET against the same "project", one for the IP, the other for the WS?
* or, set off the IP in non-debug-run mode, then set off the WS in debug-run-mode