Index: openacs-4/packages/xowiki/tcl/tree-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/tree-procs.tcl,v
diff -u -r1.23.2.6 -r1.23.2.7
--- openacs-4/packages/xowiki/tcl/tree-procs.tcl	7 Aug 2020 10:30:57 -0000	1.23.2.6
+++ openacs-4/packages/xowiki/tcl/tree-procs.tcl	15 Oct 2020 06:38:00 -0000	1.23.2.7
@@ -410,9 +410,11 @@
         ::xo::Page requireCSS urn:ad:css:yui2:treeview/assets/$style/tree
       }
     }
+    ::xo::Page requireJS urn:ad:js:yui2:yahoo/yahoo-min
     ::xo::Page requireJS urn:ad:js:yui2:yahoo-dom-event/yahoo-dom-event
 
     if {$ajax} {
+      ::xo::Page requireJS urn:ad:js:yui2:event/event-min
       ::xo::Page requireJS urn:ad:js:yui2:connection/connection-min
       ::xo::Page requireJS urn:ad:js:yui2:animation/animation-min
     }