WPF Adorner Clipping

Question

I have an ItemsControl in a ScrollViewer. The items in the ItemsControl are expanded to a DataTemplate which basically consis

Answer 1

I've encountered the same problem when subclassing the WPFToolkit DataGrid to draw an adorner around the current cell.

The content of the ScrollViewer is rendered by a ScrollContentPresenter instance. ScrollContentPresenter has its own adorner layer, which is accessible through the ScrollContentPresenter.AdornerLayer property.

I found that my adorner correctly clips if I add it to that layer.