diff --git a/repository/Grafoscopio/GrafoscopioNotebook.class.st b/repository/Grafoscopio/GrafoscopioNotebook.class.st
index 4f20eab..5230907 100644
--- a/repository/Grafoscopio/GrafoscopioNotebook.class.st
+++ b/repository/Grafoscopio/GrafoscopioNotebook.class.st
@@ -155,6 +155,7 @@ GrafoscopioNotebook >> initializeWidgets [
 	tree 
 		childrenBlock: [:node | node children];
 		displayBlock: [:node | node title ].
+	tree whenBuiltDo: [ tree selectedItem: (tree roots first)"; takeHighlight; yourself" ].
 	self focusOrder 
 		add: tree;
 		add: header;
@@ -522,7 +523,7 @@ GrafoscopioNotebook >> tree: anObject [
 GrafoscopioNotebook >> updateBodyFor: item [
 	item
 		ifNotNil: [ self changeBody: item ]
-		ifNil: [ self inform: 'Nil node'  ]
+		ifNil: [   ]
 ]
 
 { #category : #operation }