gui/controls/gridview.py
def _get_column_headings(self):
        "Return a list of children sub-components that are column headings"
        # return it in the same order as inserted in the Grid
        headers = [ctrl for ctrl in self if isinstance(ctrl, GridColumn)]
        return sorted(headers, key=lambda ch: ch.index)
def _get_column_headings(self):
        "Return a list of children sub-components that are column headings"
        # return it in the same order as inserted in the Grid
        headers = [ctrl for ctrl in self if isinstance(ctrl, GridColumn)]
        return sorted(headers, key=lambda ch: ch.index)
Return a list of children sub-components that are column headings