Sets the color to be used when highlighting a node.
        
        :param      color       <QColor> || None

def setHighlightColor(self, color):
        """
        Sets the color to be used when highlighting a node.
        
        :param      color       <QColor> || None
        """
        color = QColor(color)
        if self._palette is None:
            self._palette = XNodePalette(self._scenePalette)
        
        self._palette.setColor(self._palette.NodeHighlight, color)
        self.setDirty()