Redmine/app/views/custom_fields/formats/_bool.html.erb

<p><%= f.select :default_value, [[]]+@custom_field.possible_values_options %></p>
<p><%= f.text_field :url_pattern, :size => 50, :label => :label_link_values_to %></p>
<p><%= edit_tag_style_tag f %></p>