Webservice Flex

In my application I call a webservice. I try with the correct location of the WSDL and it works fine. When I change the WSDL location in the application (while running, not restarting the application) with and incorrect WSDL location, it still call the webservice with the correct location. Someone know why?

The webservice

<s:WebService id="MyWebService"
              wsdl="{modelLocator.webServiceAddress}"
              useProxy="false"/>
    <s:operation concurrency="multiple" name="GetFile" resultFormat="object"/>
</s:WebService>

How I change the location of the WSDL

<s:HGroup>
    <s:RadioButton label="WebService 1" groupName="radiogroup"
                   click="modelLocator.webServiceAddress = 'http://191.611.231.1/Service.asmx?WSDL'"/>
    <s:RadioButton label="WebService 2" groupName="radiogroup" selected="true"
开发者_如何学运维                   click="modelLocator.webServiceAddress = 'http://192.168.0.5/Service.asmx?WSDL'"/>
</s:HGroup>

Before calling the operation of my webservice

var ws:WebService = ServiceLocator.getInstance().getWebService("MyWebService");
trace(ws.wsdl);

trace(ws.wsdl) give me the location od the WSDL that I select