--- a/Tools__ViewTreeApplication.st	Sun Jul 16 14:05:41 2017 +0200
+++ b/Tools__ViewTreeApplication.st	Mon Jul 17 11:45:16 2017 +0200
@@ -3446,17 +3446,18 @@
     self redrawUnselected:selection andLock:true
 !
 
-withSelectionHiddenDo:aNoneArgumentBlock
+withSelectionHiddenDo:aZeroArgumentBlock
     "apply block with selection hidden
     "
 
-    [   self waitHiddenLevel.
-
-        aNoneArgumentBlock value
-
-    ] valueNowOrOnUnwindDo:[
+    [   
+        self waitHiddenLevel.
+        aZeroArgumentBlock value
+    ] ensure:[
         self signalHiddenLevel.
     ].
+
+    "Modified (format): / 17-07-2017 / 10:44:01 / cg"
 ! !
 
 !ViewTreeInspectorApplication::ViewTreeModel methodsFor:'aspects'!