Asynchronous call in silverlight

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Silverlight

Hi
I have a Silverlight3 application whcih is using WCF. I am calling one service which is defined in the wcf from my silverlight application recursively.

The problem is - here I am facing is that before getting the result of the first call, it is activating the second call. So some times I am getting the result of the second Call(call to wcf) befor getting the result of first call. I know that silverlight support only Sync call. But in this situation how I can handle the program flow.

Here is the details:

Silverlight appln
{
//Recursive call
    while(i<3)
    {
    callWCFAsync() //
    //do some work-- Here I want to do some work based on the result of 1 call, then based on the result of 2 call, then based on the result of 3 call(otherwise it should invoke the second call(in second iteration),only after getting the result of first call)-- How I can achieve it....??
    }
}

WCF
{
definition of callWCFAsync()
{
}
}

Please help me on this.

Thanks in Advance... :) :)