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Created attachment 14184 [details]
Source code that demonstrates issue
On Windows, when the mouse hovers over a button with BackgroundColor = White, the text changes to White and becomes unreadable.
The attached source code demonstrates this problem. Just build as a Windows project (I built using VS2015 and run on Windows 10) and run. Hover the mouse over the button. It changes to white on white and so is unreadable.
Either some more intelligent code is required to generate a different, but readable, color combination, or another property is required to allow an alternate text color to be specified.
On Windows Phone, when using the attached code, the button changes to white on blue when the user holds a finger down on the button. On Android, the background color changes but to a color that still leaves the text readable. Only on Windows does the text become unreadable.
I was able to just paste the attached code into a sample and reproduce this: http://screencast.com/t/Zg0ynf20q
It seems that the OnHover (Highlight) color of a button text is white by default.
Possible Workaround: Use a renderer to set that color to something other than white.
Thank you for taking the time to submit this feature request. We like this idea and have added it to our internal feature tracking system.
Xamarin Forms Team