Change color of overlay added by GGeoXml

[MapTester]

I want to add a line to a Google Map by loading a kml file using
GGeoXml.  Then, under certain conditions, I want to dynamically change
the color of the line to be different from the LineStyle defined in
the kml file.

Any suggestions as to how I can obtain a reference to the line in the
kml file, and then change its color?  That is, can I obtain a
reference to a specific Placemark name that is within the overlay, if
I know what the line's name is?

I haven't created a test site yet, but here is how I'm planning to
load the file and the format of the kml file:

javascript:
   var geoXml = new GGeoXml(kmlFilename);
   map.addOverlay(geoXml);

kml:
   <kml xmlns="http://earth.google.com/kml/2.2";>
   <Document>
      <name>Area name</name>
      <Style id="PathStyle">
         <LineStyle>
            <color>ffff00ff</color>
            <width>4</width>
         </LineStyle>
      </Style>
      <Placemark>
         <name>Path name</name>
         <styleUrl>#PathStyle</styleUrl>
         <LineString>
            <tessellate>1</tessellate>
            <altitudeMode>clampToGround</altitudeMode>
               <coordinates>
                  [...]

Thanks.
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