How to dynamically assign WSDL url for webservice

Dear Experts,

I am trying to dynamically assign WSDl for webservice using a global variable.

<s:WebService id="wsAcquisitionAsset" wsdl="{service}">
                  <s:operation name="CompareDates" resultFormat="object" result="CompareDates(event)"/>
                  <s:operation name="GetYearDepCalculatedBoth" resultFormat="object" result="GetYearDepCalculatedBoth(event)"/>      

public var service:String="http://localhost/AssetManagementWS/Webservice.asmx?wsdl";

variable service is initailized on creation complete but when i run my program it is not showing in my network monitor ( webservice is not called).

If i am Statically assigning value to WSDL then my webservice is called successfully.
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I had the same problem with service URL.  
what i did is explicitly sat URL to service before executing it.

for example give unique ID to WebService.
then write UniqueID.send();
and in Fault event trace UniqueID.wsdl;
It might work.

And all the time if you have a dynamic value problem trace it on every stage and you will see where it has chnaged value.

create function called Debug('All')// URL, Variable, etc

private function debug(_str:String){
  switch (_str){
    case 'All':
      trace('Url = ' + webserivice.wsdl);

    case 'URL':
      trace('URL = ' + webserivice.wsdl);

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