--- a/svghmi/detachable_elements.ysl2	Tue Mar 17 09:29:04 2020 +0100
+++ b/svghmi/detachable_elements.ysl2	Tue Mar 17 10:34:26 2020 +0100
@@ -73,3 +73,9 @@
 const "_detachable_elements", "func:detachable_elements($hmi_pages)";
 const "detachable_elements", "$_detachable_elements[not(ancestor::*/@id = $_detachable_elements/@id)]";
 
+function "debug_detachables" {
+    foreach "$detachable_elements"{
+        |  «@id»
+    }
+}
+!debug_output_calls.append("debug_detachables")