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The fill color can be changed when the user mouse over the map. You need to define <rollOverFill> in the Layout. This sample map chart demonstrates how to set the fill color with the gradient effect for the mouse over event.

...
<MapSeries ... >
  ...				
  <rollOverFill>
    <LinearGradient angle="-45" >
      <entries>
        <GradientEntry color="#b6a4ff" ratio="0.0" />
        <GradientEntry color="#a160ff" ratio="0.5" />
      </entries>
    </LinearGradient>
  </rollOverFill>
  ...
</MapSeries>
...
rollOverFill This property is to set the color of the image of the region when the user mouse over the region.
rollOverStroke This property is to set the color of the border line of the region when the user mouse over the region.

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