Bind to a Dependency Property that is in parent's DataContext

Question

I would like to bind third column to a CollectionBindingTwo property that is within Window\'s DataContext and not inside DataContext of an Items from Coll

Answer 1

That's what the [RelativeSource][1] bindings are for. In this case you should be able to target parent data context by way of the the DataGrid's data context:

An ElementName binding should also work: