--- a/BinaryTree.st	Tue Jun 25 13:23:35 2013 +0200
+++ b/BinaryTree.st	Tue Jun 25 13:23:37 2013 +0200
@@ -415,6 +415,12 @@
 
 !BinaryTree methodsFor:'queries'!
 
+isFixedSize
+    "return true if the receiver cannot grow"
+
+    ^ false
+!
+
 rootTreeNodeClass
     ^ self treeNodeClass
 
@@ -436,11 +442,11 @@
 !BinaryTree class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libbasic2/BinaryTree.st,v 1.16 2013-03-19 09:22:46 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic2/BinaryTree.st,v 1.17 2013-06-25 11:23:37 cg Exp $'
 !
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/libbasic2/BinaryTree.st,v 1.16 2013-03-19 09:22:46 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libbasic2/BinaryTree.st,v 1.17 2013-06-25 11:23:37 cg Exp $'
 ! !