Sets the primary color used for highlighting this item.
        
        :param      color | <QColor>

def setHighlightColor( self, color ):
        """
        Sets the primary color used for highlighting this item.
        
        :param      color | <QColor>
        """
        self._highlightColor = QColor(color)
        self.setAlternateHighlightColor(self._highlightColor.darker(110))