WPF Binding UI events to commands in ViewModel

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You should use an EventTrigger in combination with InvokeCommandAction from the Windows.Interactivity namespace. Here is an example:

<ListBox ...>
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="SelectionChanged">
            <i:InvokeCommandAction Command="{Binding SelectedItemChangedCommand}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</ListBox>

You can reference System.Windows.Interactivity by going Add reference > Assemblies > Extensions.

And the full i namespace is: xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity".

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