def METHOD_NAME():
    header_row = self.find_element(".ui-grid-header-cell-row")
    username_div = header_row.find_element(
        by=By.XPATH, value=f"//{'span'}[contains(text(),'{'Username'}')]"
    )
    col_class = (
        username_div.find_element(by=By.XPATH, value="./../../..")
        .get_attribute("class")
        .split()[-1]
    )
    return col_class