如何在Gtk3::TreeViewColumn中设置背景色？

require 'gtk3'

# 创建自定义的单元格渲染器
class CustomCellRenderer < Gtk3::CellRenderer
  def initialize
    super()
  end

  def render(window, widget, background_area, cell_area, expose_area, flags)
    # 设置背景色为红色
    self.background_rgba = Gdk::RGBA.new(1.0, 0.0, 0.0, 1.0)
    super(window, widget, background_area, cell_area, expose_area, flags)
  end
end

# 创建TreeView和TreeViewColumn
treeview = Gtk3::TreeView.new
column = Gtk3::TreeViewColumn.new("Column", CustomCellRenderer.new)

# 将TreeViewColumn添加到TreeView中
treeview.append_column(column)

# 运行Gtk主循环
Gtk3.main