If you're using RIA services and have ever drag-and-dropped a datasource onto a user control, you've likely seem the generated Load button that fires a command to load data:
<Button Content="Load" Margin="3" Name="myDomainDataSourceLoadButton" Command="{Binding Path=LoadCommand, ElementName=myDomainDataSource}" />
If your control has multiple DomainDataSources and you'd like to trigger them all by a single button click, you can change your markup:
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
<Button Content="Load" Margin="3" Name="myDomainDataSourceLoadButton">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<i:InvokeCommandAction Command="{Binding Path=LoadCommand, ElementName=myDomainDataSource}"/>
<i:InvokeCommandAction Command="{Binding Path=LoadCommand, ElementName=myOtherDomainDataSource}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
I left out the markup for the DomainDataSource and its query parameters, etc, but this should get the point across.
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