Binding CommandParameter on ItemsControl Tap event - windows-phone-7

Question

I'm using an ItemsControl, and I want to identify which item was selected on the Tap command. My xaml is defined here:
<ItemsControl ItemsSource="{Binding AllMyItems}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Tap">
<cmd:EventToCommand Command="{Binding ItemSelectedCommand}" CommandParameter="{Binding}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
.... item template ....
and here is my view model:
public RelayCommand<MyItem> ItemSelectedCommand { get; private set; }
public MainViewModel()
{
ItemSelectedCommand = new RelayCommand<MyItem>(ItemSelected);
}
private void ItemSelected(MyItem myItem)
{
throw new NotImplementedException();
}
The event to command works, but when I get to the ItemSelected method, myItem is either Null, or I get an exception casting it (depending on how I define the CommandParameter in the xaml).
I can do this if I use a ListBox and set CommandParameter="{Binding SelectedItem, ElementName=MyItemsList"}
Any ideas on how to do this with ItemsControl? Or does the perf difference not make much of a difference between the two in Mango?

Answer 1

Your Tap Event is occuring on the ItemsControl , you should place your EventToCommand inside the ItemTemplate , some XAML to clear the things for you
<ItemsControl ItemsSource="{Binding AllMyItems}">
<ItemsControl.ItemTemplate>
<...>
<i:Interaction.Triggers>
<i:EventTrigger EventName="Tap">
<cmd:EventToCommand Command="{Binding ItemSelectedCommand}" CommandParameter="{Binding}"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</...>
</ItemsControl.ItemTemplate>
...