Silverlight 4 - BusyIndicator working with a DomainDataSource

Can someone please help me get this to work? I am trying not to use code behind as I'm putting a little test application together to test WCF Ria Servi开发者_JAVA技巧ces.

<my2:BusyIndicator IsBusy="{Binding ElementName=targetDomainDataSource}" BusyContent="{Binding}" DisplayAfter="0:0:0.1">

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Change your binding too IsBusy="{Binding IsBusy, ElementName=targetDomainDataSource}"