>>Refresh do the task with Control's index order, because control index = Zorder,
>>then the last index = ControlCount it is the last refreshed member.
>>
>>object.ZOrder(0) set the object index to ControlCount, then Refresh process finished.
>
>Thanks for the explanation, it is unfortunate that it works this way thou, and it would have been nice if it was documented "Do not use ZOrder in the refresh of objects contained in a container if you want it to work properly" :)

The documentation should not say what to do,
but must explain in great detail how the machine works
where running the program written by developers.
In the case of high-level languages, often those who create the environment
are reluctant to explain the backstage.
Enough say that all cycles are based on VFP's control index,
and that ZOrder (1) sets the control index to 1 and ZOrder (0) sets it to ControlCount.
This makes it clear that within a loop, ZOrder(1) makes the infinite loop
and ZOrder (0) stops him immediately.