<div class="control-group">
  % if (my $label = stash 'control_group.label') {
    % my @for;
    % if ( my $for = stash 'control_group.for' ) {
      % push @for, for => $for;
    % }
    %= tag label => class => 'control-label', @for, begin
      %= $label
    % end
  % }

  <div class="controls">
    %= stash 'control_group.contents'
  </div>
</div>