The PieChart widget comes with API members that allow you to select the series in code. To set a custom 'selected' style for the series, use the selectionStyle object within the series configuration object.

To set custom border settings specific to the 'selected' state for the series, use the properties of the series.selectionStyle.border configuration object.

This option supports the following colors:

• Hexadecimal colors
• RGB colors
• RGBA colors
• Predefined/cross-browser color names
• Predefined SVG colors
• Paint server address

Within this object you can specify how to apply hatching using the direction option, the width and opacity of lines with the width and opacity options, and the space between the lines using the step option.