--- a/SelectionInTree.st	Tue Oct 17 03:40:20 2017 +0000
+++ b/SelectionInTree.st	Thu Oct 19 12:15:57 2017 +0200
@@ -122,12 +122,12 @@
 
 !SelectionInTree methodsFor:'accessing hierarchy new'!
 
-doMakeVisible:something
-    "make an item or list of items to become visible"
+doMakeVisible:itemOrCollectionOfItems
+    "make an item or collection of items visible"
 
     |anchor parent|
 
-    self each:something do:[:anItem|
+    self each:itemOrCollectionOfItems do:[:anItem|
         parent := anItem.
         anchor := nil.
 
@@ -144,7 +144,7 @@
         ].
     ]
 
-    "Modified (comment): / 04-02-2017 / 19:37:02 / cg"
+    "Modified (comment): / 18-10-2017 / 11:55:53 / cg"
 ! !
 
 !SelectionInTree methodsFor:'accessing-behavior'!
@@ -630,16 +630,19 @@
 
 !SelectionInTree methodsFor:'enumerating'!
 
-each:something do:aBlock
+each:itemOrCollectionOfItems do:aOneArgBlock
     "evaluate a block for something or in case of a collection for each
      element in the collection"
 
-    something notNil ifTrue:[
-        something isCollection ifTrue:[something do:[:el|aBlock value:el]]
-                              ifFalse:[aBlock value:something]
+    itemOrCollectionOfItems notNil ifTrue:[
+        itemOrCollectionOfItems isCollection ifTrue:[
+            itemOrCollectionOfItems do:aOneArgBlock
+        ] ifFalse:[
+            aOneArgBlock value:itemOrCollectionOfItems
+        ]
     ]
 
-    "Modified (comment): / 04-02-2017 / 19:37:07 / cg"
+    "Modified (format): / 18-10-2017 / 11:55:36 / cg"
 ! !
 
 !SelectionInTree methodsFor:'initialization'!
@@ -799,15 +802,19 @@
 !SelectionInTree methodsFor:'selection'!
 
 selectNode:aNode
-    "select a given node (by identity - not by index)"
+    "select a given node (by identity - not by index).
+     Notice, that the node must be visible - i.e. its parent chain must be
+     currently expanded."
     
     |index|
 
     (index := self indexOf:aNode) ~~ 0 ifTrue:[
         self selectionIndex:index
+    ] ifFalse:[
+        "/ self halt.
     ]
 
-    "Modified (comment): / 04-02-2017 / 19:40:42 / cg"
+    "Modified: / 18-10-2017 / 11:56:20 / cg"
 !
 
 selectNodes:aCollectionOfNodes