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Calling ViewModel Methods
XAML
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<Button
    Grid.Column="0" IsEnabled="{Binding CanStart}" ToolTip="Start the proxy." Content="Start">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="Click">
            <ie:CallMethodAction TargetObject="{Binding}" MethodName="Start"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</Button>

The above is WPF-specific, similar mechanisms exist for Windows Store Apps, see CallMethodAction