It may not work properly with custom controls non-derived from ItemsControl (someone of popular WPF control vendors introduces custom ItemsControl type, for example), but you can still help R# specifying DataType property of DataTemplate.

If you have any troubles with binding type calculation with some type of controls or any other issue with XAML - our youtrack is the great place to report it, thanks!

In the past, I’ve had trouble with the data context type annotations. I can tell R# that my UserControl’s DataContext is of type MyCollectionViewModel, but then if I add an ItemsControl and bind it to my viewmodel’s Items property, R# complains about the bindings inside my ItemTemplate — it still thinks those DataContexts should be of type MyCollectionViewModel, rather than realizing they should be of whatever type is inside the MyCollectionViewModel.Items collection. I haven’t taken the time to write this up in YouTrack yet.

Has any work been done in this area? If this is already fixed, great — if not, I’ll try to write up repro steps at some point.