I wrote an EventToCommand behavior using Xamarin Forms 1.3 behaviors and I would like to share it with you : anthonysimmon.com/eventtocommand-in-xamarin-forms-apps/
You will find an example where the EventToCommand is bound to the ItemTapped of a ListView so that we can get the tapped item data context inside a command of the ListView data context:
<ListView ItemsSource="{Binding People}">
<ListView.Behaviors>
<b:EventToCommandBehavior EventName="ItemTapped" Command="{Binding SayHelloCommand}" EventArgsConverter="{StaticResource ItemTappedConverter}" />
</ListView.Behaviors>
<ListView.ItemTemplate>
<DataTemplate>
<TextCell Text="{Binding Name}"/>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>