--- a/AbstractBackground.st	Wed Feb 02 12:17:04 2011 +0100
+++ b/AbstractBackground.st	Thu Feb 03 20:31:44 2011 +0100
@@ -64,19 +64,21 @@
 !AbstractBackground methodsFor:'ignored conversion'!
 
 asFormOn:aDevice
-    ^ nil
+    self subclassResponsibility
 
     "Created: / 23-01-2011 / 01:45:35 / cg"
+    "Modified: / 03-02-2011 / 19:55:49 / cg"
 !
 
 onDevice:aDevice
-    ^ nil
+    self subclassResponsibility
 
     "Created: / 23-01-2011 / 01:46:11 / cg"
+    "Modified: / 03-02-2011 / 19:55:40 / cg"
 ! !
 
 !AbstractBackground class methodsFor:'documentation'!
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/libview/AbstractBackground.st,v 1.3 2011-01-23 01:43:13 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libview/AbstractBackground.st,v 1.4 2011-02-03 19:31:44 cg Exp $'
 ! !