Transaction in WCF Enabled Web Service!.. HELP?

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C#

WCF

Silverlight

webservice

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Hi all,
In a silverlight project which I develop, I should begin transaction when the child window loaded.If user clicks OK, all work will be commited, else will be rollback.
I added a wcf-enabled web service fot this purpose,

web.config is like below:

<customBinding>
 <binding name="myWebService.customBinding0">
                    <transactionFlow transactionProtocol="OleTransactions"/>
                    <httpTransport />
                </binding>
            </customBinding>

When I add service reference, it adds the config settings at clientConfig side like below.

clientConfig

 <customBinding>
   <binding name="CustomBinding_myWebService">
                    <binaryMessageEncoding />
                    <httpTransport maxReceivedMessageSize="2147" maxBufferSize="2147" />
                </binding>
            </customBinding>
  <endpoint address="http://localhost/myWebService.svc"
                binding="customBinding" bindingConfiguration="CustomBinding_myWebService"
                contract="myWebServiceReference.myWebService" name="CustomBinding_myWebService" />
 <endpoint/>

After I add my methods to the service for transaction, after updating , it removes the binding settings in clientConfig. I can not create the client of service. Because there is no binding to add. How can I solve this problem?
Thanks in advance for the replies..