>>But then, Dmitry, don't you need to center the VFP screen, first? If you center a child form inside the main VFP window, it centers against the VFP _Screen window, not against your device screen. Unless, of course, your VFP main form is running maximized.
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>>Anyway, a stabilized version of this code would fit in a subclass, instead of replicating it in every form of your project (if you're not using subclasses, and instantiating VFP base classes instead, perhaps you could consider refactoring your project - but that is a different story).
>
>The VFP screen (main window) always runs maximized. And when I rotate the tablet I don't see a problem with the entire main window. But the currently open form then moves to the left-most position (on rotation). So I will need to move it to the center.
>All windows are bases on the VFP form class in a separate .VCX. So I will need to add the code to the base form and then every form using this base class should be ok. I think. So far I am not 100% sure where to put your "centering" code (that is, in which method the code should go). Or maybe in INIT method?

If your application is running maximized, then it should be ok.

In the your class, add the ReCenter method. In the Init, add the event binding, and the unbinding to the destroy event code. That should be enough (at least, that what I think, but in a few hours I will try it for myself, at home).