Sets the palette highlighting for this tree widget to use a darker
        version of the alternate color vs. the standard highlighting.

def highlightByAlternate(self):
        """
        Sets the palette highlighting for this tree widget to use a darker
        version of the alternate color vs. the standard highlighting.
        """
        palette = QtGui.QApplication.palette()
        palette.setColor(palette.HighlightedText, palette.color(palette.Text))
        
        clr = palette.color(palette.AlternateBase)
        palette.setColor(palette.Highlight, clr.darker(110))
        self.setPalette(palette)