I did a little more digging and it appears I need to explicitly set .Zoom.Brush.Transparency to something greater than 0 (which seems to be the default) to achieve the previous behavior.

I recently upgraded TeeChart .NET from an older version (4.2018.10.1) to the latest release (4.2022.10.11). Everything seems to be working as expected so far with the exception of the zoom rectangle, which is now filled with a solid color rather than being transparent. How can I return this to the p...