At runtime there is no way to easily access values from fields within the same row of a report using the WPF ReportViewer.  We have a requirement for our application where users may double-click a field and trigger the applicable editor to appear for quick access.  To enable this functionality, we need to retrieve values from within the same row as the field that was clicked.
While the TextBlock that was clicked may be accessed, there is no way to easily determine which controls within the control hierarchy belong to the same row as all page content is lumped into one canvas.  Searching for values by Name is not possible either as the name is not passed into the generated controls.
It is also not possible to create custom IAction implementations to handle this functionality either as they are not supported.