--- a/flys-client/ChangeLog	Fri Mar 18 13:45:34 2011 +0000
+++ b/flys-client/ChangeLog	Mon Mar 21 08:28:02 2011 +0000
@@ -1,3 +1,31 @@
+2011-03-21  Ingo Weinzierl <ingo@intevation.de>
+
+	* src/main/java/de/intevation/flys/client/client/event/HasStepBackHandlers.java,
+	  src/main/java/de/intevation/flys/client/client/event/StepBackHandler.java,
+	  src/main/java/de/intevation/flys/client/client/event/StepBackEvent.java:
+	  New. These classes are used to realize a notification mechanism to
+	  listen to the step-back part of the advance() operation. UI elements
+	  should fire a StepBackEvent if the user tries to step back to a previous
+	  state.
+
+	* src/main/java/de/intevation/flys/client/client/ui/AbstractUIProvider.java:
+	  The UIProvider implements the HasStepBackHandlers interface and fires
+	  StepBackEvents if the 'back' button has been clicked.
+
+	* src/main/java/de/intevation/flys/client/client/ui/ParameterList.java:
+	  Listens to StepBackEvents. If such an event is received, we gonna remove
+	  all old state items from the list and revert the view. Afterwards, the
+	  artifact description is used to redraw the whole view.
+
+	  NOTE: I think we should just remove those items that belong to states
+	  between the current state and the target state. This would avoid a
+	  complete refresh of the ParameterPanel.
+
+	* src/main/java/de/intevation/flys/client/client/ui/CollectionView.java:
+	  Listens to StepBackEvents. If such an event is received, the advance()
+	  operation is triggerd with the current artifact and the new target
+	  state identifier to step back to that state.
+
 2011-03-18  Ingo Weinzierl <ingo@intevation.de>
 
 	* src/main/java/de/intevation/flys/client/client/ui/DoubleRangePanel.java,