SilverStripe: make a piece of HTML optional in page -

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i not sure how , cant find example on silverstripe site.

i want make checkbox in cms field list. when checked page display code block have. when not checked not.

in page.ss have like:

<% if $showprintbutton %>     $showprintbutton <% end_if %>

here relevant code

private static $db = [     'showprintbutton' => 'boolean(1)' ];  private static $defaults = [     'showprintbutton' => true ];  public function getcmsfields() {     ...     $fields->addfieldtotab('root.main', checkboxfield::create('showprintbutton', 'allow printing page'));     ... }

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