--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/m/gui/gltpda/g_UndoButtonCallback.m	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,24 @@
+    function g_UndoButtonCallback(varargin)
+    % Whenever the user clicks on the 'Undo' button.
+    
+         global params oldparams paramEnabled oldparamEnabled selBlocks
+    
+         temp = paramEnabled;
+         paramEnabled = oldparamEnabled;
+         oldparamEnabled = temp;
+
+         paramcommand = g_BuildParamCommand(params);
+         for kk=1:length(selBlocks)
+            set_param(selBlocks(kk),'Description',paramcommand);
+         end
+         g_AnnotationUpdate(params);
+         
+       % This to swap params and params, so it's possible to undo the undo:
+         temp = params;
+         params = oldparams;
+         oldparams = temp;
+         clear temp;
+
+         ltpdagui('Redraw',2)
+         
+    end