Ws:webservices, variable wsdl problem

Question

Hi all.
I pass a url variable when i call my swf. like this
quote:
myfile.swy?wsdlurl=http://......
and I get back the value in my flex app by :
quote:
[Bindable]public var urlwsdl:String;
urlwsdl = mx.core.Application.application.parameters.wsdlurl;
When I make a Alert whis the value of urlwsdl, i have the
good URL
I call it in my webservices call like this :
quote:
<mx:WebService id="WS" wsdl="{urlwsdl}" ...
And thats no work.
But if i put directely the value and no the variable, all
work fine ..
Some idea ?

Answer 1

if i define my urlwsdl varaible like this :
quote:
[Bindable]public var wsdlurl:String;
urlwsdl = 'url....';
wsdl="{urlwsdl}"
thats not work
If i define it like this :
quote:
[Bindable]public var wsdlurl:String = 'url...';
wsdl="{urlwsdl}"
Thats work .....
I realy dont understand ... why ...
pff .. impossible to make wsdl dynamic ?