Highlight selected row.

def on_table_row_click(self, row, item):
        ''' Highlight selected row.'''
        if hasattr(self, "last_clicked_row"):
            del self.last_clicked_row.style['outline']
        self.last_clicked_row = row
        self.last_clicked_row.style['outline'] = "2px dotted blue"
        return (row, item)