Help! Invoking the same Web Service from multiple mxml components

Question

Hi,
I'm building an application that interacts with a Web Service.  The application (App A) has a tabNavigator with two tabs (Tab1 and Tab2).  Tab1 contains a custom component (Comp A) and Tab2 contains another custom component (Comp B). Tab1 is the first tab, and Tab2 is the second tab.
Comp A and Comp B each handles the "creationComplete" event by invoking an operation, Op1,  of the Web Service.
The problem is, when App A starts up, Comp B can successfully invoke Op1 in its creationComplete handler, but Comp A cannot.  In fact, Comp A's call to Op1 does not return.  Comp A is created before Comp B.
If the application has only one tab (either Tab1 or Tab2), each Comp can successfully invoke Op1 at application start-up.
Comp A and Comp B each has its own declaration section for the Web Service and CallResponder for Op1.
I'm using the trial version of Flex Builder 4 and new to flex application development.  Any help in debugging this problem would be greatly appreciated.
Much thanks,
--Hyong

Answer 1

I've been shown by a colleague (who is more experienced in .Net than am I) that this can be achieved by adding the target web service's WSDL to my invoking web service as a Web Reference.  The original logic I was using, though working from VB 6 and Active Server Pages, can be simplified through the use of the WSDL definition for implementation in .Net.
Thank you for your responses,
-- Chris