J Biel

Two issues: tab key does not work in MainWindow elements and there's an erroneous overlay

1

I'm playing around with this library (it looks like the best option for building a small Windows app) and found two issues with it in my testing. The [parent fork](https://github.com/lxn/walk)...

Add a channel that can reset the backoff algorithm within an active Retry(). This can be useful for very long running or infinite retries.