Hello,

This is possible through the use of the seriesMouseMove event. In here you'll want to store a value that allows you to identify which item was hovered over and then tell the map to rerender through the use of the renderSeries method. Next, you'll want to modify the shapeStyleSelector.selectStyle function to check if an item has been hovered and if so change the brush.

I've modified one of our samples on jsFiddle to demonstrate this approach:

http://jsfiddle.net/t6b2Ldh6/

Please let me know if you have any questions or concerns about this implementation.