Dynamically add some elements in WebService operation request

Question

Hi, 
I have a WebService element defined in my mxml which use to make soap calls. 
I need to dynamically add some repeating groups for action (dependent on action) in the following example. 
How can I add this in Action Script section? Can I access the WebService  by id userRequest and specify " 
userRequest.operations.DoAction.request.DoItemActionRequest.action.requiresAdditionItems.n ameValuePair.name = "SomeName"; 
userRequest.operations.DoAction.request.DoItemActionRequest.action.requiresAdditionItems.n ameValuePair.name = "SomeValue";  
<mx:WebService  id="userRequest" wsdl="{Application.application.wsdl}" > 
     <mx:operation name="DoAction" resultFormat="object" 
      fault="faultHandler(event)" 
      result="DoActionHandler(evnt)">
        <mx:request> 
          <DoActionRequest> 
             <userId>{Application.application.userID}</userId> 
              <action> 
                 <actionId>{selectedItem.actionId}</actionId> 
             </action> 
          </DoActionRequest> 
         </mx:request> 
       </mx:operation> 
</mx:WebService>
Thanks,
Amitava

Answer 1

Hi miguel8312,
Thanks for your suggestion. I understand the steps you explained for defining, calling and processing the result from a webservice from a MXML body.
My query is specifically, can I modify the webservice request defination from AS function before making the call?
In my example, if I need to dynamically add a name value pair for <action> tag (e.g. actionParam ), how do I do that?
Thanks,
Amitava