Binding to Count attribute of ObservableCollection Silverlight

I have an ObservableCollection and a Datagrid.

What I do is:

datagrid.ItemsSource = observableCollection1;

And I need to make a binding to the observableCollection.Count attribute.

I tryed:

  Tag="{Binding ObservableCollection.Count}"
  Tag = "{Binding Count}"
  Tag = "{Binding .Count}"
  Tag = "{Binding开发者_C百科 Path=.Count}"

But it dosen't work. :(

Help

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Tag="{Binding ItemsSource.Count, RelativeSource={RelativeSource Self}}"

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Tags must be bound to strings. You should create a converter to cast it from a numeric value to string. If you only see 0 this is probably the resolution. This would be the first thing I would explore though you would expect it cast it using ToString().

See this for how to do it:

http://forums.silverlight.net/forums/p/184232/419976.aspx

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What I do is take the selected item from the datagrid attribute SelectedItem and with that I don't have to put tags to buttons ;)