Specifies the appearance of groups in the selected state.
When the user selects a group, this element responds by changing its style. Using the fields of the selectionStyle object, you can specify the color of group headers and appearance of group borders in the selected state.
To learn how to implement the selection feature and get familiar with available selection modes, refer to the selectionMode option description.
Colors the group headers in the selected state.
This option supports the following colors:
- Hexadecimal colors
- RGB colors
- RGBA colors
- Predefined/cross-browser color names
- Predefined SVG colors
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