Hi Michael,
Sorry about the inconvenience caused.
We are able to reproduce the issue in iOS Xamarin.Forms. We will fix this issue in our next service pack release which will be available at the end of November, 2014. However, you can resolve this issue by using following workaround,
Code snippet [C#]:
Color color = Color.Gray;
ColumnSeries series = newColumnSeries ();
series.Color = Device.OnPlatform (Color.FromRgba (color.R / 255, color.G, color.B / 255, color.A / 255), color, color);
We have prepared a sample based on this and you can find the sample in the following location.
Disclaimer: The date for the release is tentative and not a commitment on our parts.
Please let us know if you require further assistance on this.
Regards,
Karthikeyan V
Attachment:
SimpleChartSample_b3719ad.zip