<% button_to 'Foo button', '/foo', :class => 'foo-form' do %>
  <% field_set_tag do %>
    <%= hidden_field_tag :session_id, :value => "__secret__" %>
    <%= label_tag :username %>
  <% end %>
<% end %>
<%= content_tag(:p, 'button_to test', :id => 'test-point') %>
<%= button_to 'Bar button', '/bar' %>
