how to change piechart IndependentValuePath font colors

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Windows

XAML

Win8

in windows store app am using piechart with default font color is white.
but my app backgroubd is also white so unable to see the names of IndependentValuePath binding. pls help me how to change the font colors of IndependentValuePath.

<charting:chart x:name=""CIPieChart"" horizontalalignment=""Left"" verticalalignment=""Top"" margin=""76,266,0,0"" width=""394"" height=""212"><br" mode="hold" xmlns:x="#unknown" xmlns:charting="#unknown" />    <Charting:PieSeries Foreground="Blue" Title="Channel Incentives Status" Margin="-18,-9,-20,-7" IndependentValuePath="Name" DependentValuePath="Amount" IsSelectionEnabled="True" />
</Charting:Chart>