Windows Phone 8.1 - MVVMLight - Why is EventToCommad not working?

Question

I am not able to use EventToCommand in my Windows Phone 8.1 App.

xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WP8"

I tried it also with assembly=GalaSoft.MvvmLight.Extras.WP81...

<controls:PivotItem Name="pivotItem">
<i:Interaction.Triggers>
    <i:EventTrigger EventName="SelectionChanged">
        <cmd:EventToCommand Command="{Binding SelectServiceCommand}"
                            CommandParameter="{Binding SelectedIndex,                                 ElementName=pivotItem}"/>
    </i:EventTrigger>
    <!-- other stuff  -->
</i:Interaction.Triggers>

I get the following erros:

• The member "Triggers" is not recognized or is not accessible.
• Unknown type 'EventTrigger' in XML namespace 'clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity'
• Error 2 The attachable property 'Triggers' was not found in type 'Interaction'. ...

Can someone help me please?

Answer 1

Are you aiming at Silverlight, or WinRT (Universal Apps) kind of Windows Phone 8.1?

If you have chosen the second option, then in this blog post MVVM Light author explains the lack of support for EventToCommand - basically in WinRT there's already a mechanism similiar to the EventToCommand - Behaviours.