NetBeans IDE Dev (Build 200704051800)
1.6.0; Java HotSpot(TM) Client VM 1.6.0-b105
Linux version 2.6.16-1.2122_FC5 running on i386

Example:

System.out.println((msgMemory.format (new Object[] {
                                      new Long (total),
                                      new Long (free),
                                      new Integer (taken)})));

Steps:
1. Invoke Step Over Expression in this expression to display Return values
history node in Local Variables view with one return value - first of 'Long()'
constructors.
2. Invoke Step into on the second constructor
3. Invoke Step Out from the constructor code
4. The return value will be there
5. Invoke Step Over Expression

Result: 'Return values history' node will disappear and will not be shown after
any of another steps in the expression.