A value that determines the styles that will be applied to the chart's text. For a full list of the available Style options, please see the Style Options topic.
Type: Object
Default: {fill:"#888", "font-size": 10, stroke:"none"}
Code Example:
var linechart = document.getElementById("wijlinechartDefault").winControl;
WinJS.UI.setOptions(linechart, {
textStyle: {fill: "red"}
});