def METHOD_NAME(self):
    super().METHOD_NAME()
    self.rows = [c for c in self.rows if not c.hidden]
    self.describeData = { col: {} for col in self.rows }
    self.columns = []
    for c in type(self).columns:
        self.addColumn(c)
    self.setKeys(self.columns[:self.nKeys])
    for aggrname in vd.options.describe_aggrs.split():
        self.addColumn(DescribeColumn(aggrname, type=float))
    for srccol in Progress(self.rows, 'categorizing'):
        if not srccol.hidden:
            self.reloadColumn(srccol)