A example panel that just prints the text of the feature.

def example_panel(self, ax, feature):
        """
        A example panel that just prints the text of the feature.
        """
        txt = '%s:%s-%s' % (feature.chrom, feature.start, feature.stop)
        ax.text(0.5, 0.5, txt, transform=ax.transAxes)
        return feature