Rebuilds the buttons for this widget since they use specific palette
        options.
        
        :param      palette | <QPalette>

def setPalette(self, palette):
        """
        Rebuilds the buttons for this widget since they use specific palette
        options.
        
        :param      palette | <QPalette>
        """
        super(XSplitButton, self).setPalette(palette)
        self.rebuild()