在点按-树状图-高图上保持标记状态

我正在TreeMap上工作，在那里我能够在特定数据点的悬停上给予borderColor。同样在这个小提琴链接-> http://jsfiddle.net/vgnshs/z8ncv2d5/。

但我需要的要求，我应该得到相同类型的borderColor在点击一个特定的数据点(对用户说，点被选中)和borderColor应该持续，直到我再次点击同一点或plotArea以外的地方。(我看到这个功能是可用的气泡图，同样需要在TreeMap)。此外，我应该能够选择多个点，所有被选中的点应该有相同的borderColor。

目前，TreeMap的选择事件用不同的颜色填充整个点，这是我不想要的。只有borderColor应该被改变。我如何在TreeMap中实现这一点?

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