How to get the index of an item in an itemscontrol - xaml

Question

I want to show the current index of an item in an itemscontrol:
<TextBlock Foreground="#ffffffff" Margin="8,8,2,2" TextWrapping="Wrap" Text="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}, Path=Items.CurrentIndex}" Grid.Column="0" Grid.Row="0" HorizontalAlignment="Right"/>
This is my best guess. I've come across many possible solutions, but working with alternationcount (not supported in silverlight as it seems) or other didn't give me a result.
The itemscontrol looks like this:
<ItemsControl Grid.Column="0" Grid.ColumnSpan="3" HorizontalAlignment="Stretch" Grid.Row="6" ItemsSource="{Binding Alternatives, Mode=TwoWay}" ></ItemsControl>
The list bound to the itemscontrol is a simple object with some properties.
I really like to do this in XAML, as we reuse that object on alot of pages.
Any good suggestions would be great.
PS: I don't want the index after interaction from the user, it should be retrieved automatically.

Answer 1

if you want the index of an item in an itemscontrol - it just make sense for me if there is some sort of selection. but the itemsscontrol has no selector and so no selection and so no selectionchanged event. so if you want some selection take listbox
one more thing
<ItemsControl ItemsSource="{Binding Alternatives, Mode=TwoWay}" ></ItemsControl>
mode=twoway makes no sense, cause your itemsscontrol will never set the underlining source.
EDIT: i just assume what you want from your comment. you can use a ICollectionView to iterate through your items. but your Itemscontrol can not show this of course. but you can alter the item itself to show the iteration
ICollectionView view = CollectionViewsource.GetDefaultView(Alternatives);
view.CurrentChanged += (s,a) =>
{
var current = this.view.CurrentItem;
//to stuff with your current item here
};
elsewhere where you want to iterate
view.MoveCurrentToNext();
you should handle first and last item and that stuff too.