How to include a check box while using wice grid

Hello every one, I am trying to implement the wice grid in my project.In that I want to display check boxes.my code is like the following

<%= grid(@users_grid,:table_html_attrs => {:class => 'grid_style', :id => 'accounts_grid'}, :header_tr_html_attrs => {:class => 'grid_headers'}) do |g| g.column :column_name => 'Login', :attribute_name => 'login' do

account>

  account.login

end

end -%> how can I include a check box <input type="checkbox"> I don't want check_box_tag

pls help. Thanks in advance