As a precursor, I clicked on the "send comments on this article" link at the top of the API page which opened an email to support. After hassling me about my EDN they then blew me off (basically told me I did it wrong) and told me to send it from the beta site (which I had) because I'm apparently supposed to use a non-existent "send feedback" link in the API documentation.
In this section of the documentation the ScaleLine references a "Color" property that doesn't exist. The Foreground property exists and works, but there is no Color property. I'm not sure where the disconnect is but the example code/XAML references a Color property, but it isn't valid when I try it.
There is indeed no Color property on the ScaleLine - apologies for the misleading doc.
Regarding bug submission, technical support are supporting the beta process but the beta site they refer to is the main beta community site (https://betacommunity.esri.com) through which you can also submit bugs. Once logged in to that site, select the Beta Program (e.g. ArcGIS Runtime for Desktop) you're part of, then choose Bug Report (under Send Feedback) and fill in the details.
