Add InitialVisibility to Section

code/extensions/DisplayRulesExtension.php

@@ -7,6 +7,11 @@ class DisplayRulesExtension extends DataExtension {
         'DisplayRuleAction' => 'Enum("Show, Hide")',
         'DisplayRuleControlField' => 'Varchar(150)',
         'DisplayRuleControlFieldValues' => 'Text',
+        'InitialVisibility' => 'Boolean(1)',
+    );
+
+    private static $defaults = array(
+        'InitialVisibility' => 1,
     );
 
     public function updateCMSFields(FieldList $fields)