+
−    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