How to set maxItemsInObjectGraph for Silverlight Domain Services

<services>
<service name="BusinessApplication5.Web.Services.DomainService1"
behaviorConfiguration="BusinessApplication5-Web-Services-DomainService1">
</service>
</services>
<behaviors>
<serviceBehaviors>
<behavior name="BusinessApplication5-Web-Services-DomainService1">
<serviceMetadata httpGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="true" />
<dataContractSerializer maxItemsInObjectGraph="655360000"/>
</behavior>
</serviceBehaviors>
</behaviors>