UI.Win - TreeList focus is restored incorrectly after canceling changes in ListViewAndDetailView mode

I noticed some strange behaviour using a TreeList in MasterDetailView.
After applying some changes in the DetailView of an existing object and a mouseclick
on a different node in the ListView a messagebox is displayed ( save yes/no, or abort ).
When I press 'save yes' the result is as expected, the changed object ist persisted,
the clicked node is focused in ListView and shown in DetailView.
When I Press 'save no' I would expect a similar behaviour with the only difference that the changed
object is not persisted. However in this case the results are not predictable : the clicked node does not
receive the focus and the DetailView does not display the selected node-object. In some cases the DetailView
shows an object other than the clicked-node-object.
To reproduce this effect you can use the following scenario :
TreeList :
   P1
      P11
   P2
      P21
1.Example :
- Make P21 active, all nodes expanded
- change some data of P21 in DetailView
- click on P11
- confirm the message with 'save no'
- result :
     TreeList is collapsed to
        P1
        P2 ( <- focued )
           P21
     DetailView shows object P2
2.Example :
- Make P11 active, all nodes expanded
- change some data of P11 in DetailView
- click on P21
- confirm the message with 'save no'
- result :
     TreeList is collapsed to
        P1
          P11
        P2
     DetailView does not show an object
Thanks
Johann