In DataTable,how can I remove horizontal lines？

[niuniudd]

In order to remove horizontal lines,I comment this code below:horizontal_lines=ft.border.BorderSide(1, "green"), but also display horizontal lines in datatable,what should I do?

import flet as ft

class data_tabs_navagation(ft.Row):
    def __init__(self,datatable):
        self.data_Tabs = ft.Tabs(
            selected_index=0,
            animation_duration=300,
            tabs=[
                ft.Tab(
                    text="Tab 1",
                    content=ft.Container(
                        content=datatable, alignment=ft.alignment.center
                    ),
                ),
                ft.Tab(
                    tab_content=ft.Icon(ft.icons.SEARCH),
                ),
                ft.Tab(
                    text="Tab 3",
                    icon=ft.icons.SETTINGS,
                ),
            ],
            expand=1,
            on_change=self.tab_change
        )
        super(data_tabs_navagation, self).__init__(controls=[self.data_Tabs],expand=True)

    def tab_change(self, e):
        self.data_Tabs.selected_index = int(e.data)
        self.data_Tabs.tabs[self.data_Tabs.selected_index].content = data_tab()
        self.update()
class data_tab(ft.Row):

    def __init__(self):
        self.t = ft.DataTable(
            width=700,
            bgcolor="yellow",
            border=ft.border.all(2, "red"),
            border_radius=10,
            vertical_lines=ft.border.BorderSide(3, "blue"),
            #horizontal_lines=ft.border.BorderSide(1, "green"),
            sort_column_index=0,
            sort_ascending=True,
            heading_row_color=ft.colors.BLACK12,
            heading_row_height=100,
            data_row_color={"hovered": "0x30FF0000"},
            show_checkbox_column=True,
            divider_thickness=0,
            column_spacing=200,
            columns=[
                ft.DataColumn(
                    ft.Text("Column 1"),
                    on_sort=lambda e: print(f"{e.column_index}, {e.ascending}"),
                ),
                ft.DataColumn(
                    ft.Text("Column 2"),
                    tooltip="This is a second column",
                    numeric=True,
                    on_sort=lambda e: print(f"{e.column_index}, {e.ascending}"),
                ),
            ],
            rows=[
                ft.DataRow(
                    [ft.DataCell(ft.Text("A")), ft.DataCell(ft.Text("1"))],
                    selected=True,
                    on_select_changed=lambda e: print(f"row select changed: {e.data}"),
                ),
                ft.DataRow([ft.DataCell(ft.Text("B")), ft.DataCell(ft.Text("2"))]),
            ],
        )
        super(data_tab, self).__init__(controls=[self.t],expand=True)

def main(page: ft.Page):
    page.add(
        data_tabs_navagation(data_tab())
    )

ft.app(target=main)