Flushes existing decorations and highlights the given station-line.

    Args:
      # Integer, index of stop to be highlighted.
      index: 4
      # An optional string with a html color code
      color: "#fff"

def AddStationDecoration(self, index, color="#f00"):
    """Flushes existing decorations and highlights the given station-line.

    Args:
      # Integer, index of stop to be highlighted.
      index: 4
      # An optional string with a html color code
      color: "#fff"
    """
    tmpstr = str()
    num_stations = len(self._stations)
    ind = int(index)
    if self._stations:
      if 0<ind<num_stations:
        y = self._stations[ind]
        tmpstr = '<polyline class="Dec" stroke="%s" points="%s,%s,%s,%s" />' \
          % (color, 20, 20+y+.5, self._gwidth+20, 20+y+.5)
    self._decorators.append(tmpstr)