> in buttons when event
> this.parent.LastActive=thisform.activecontrol
>
> right?

Right.

> in buttons click event (after all lines of code)
>
> what?
>
> I can not assign thisform.activecontrol, I beleive, so, how can I operate here?
>
> Local lcControl
> lcControl=this.parent.LastActive
>
> thisform.lcControl.SetFocus() ????????

Much easier: thisform.LastActive.SetFocus - remember, this is an object referrence, which means it has all the properties and can call all the method code of the object it refers to. Just take care you have no objects which don't have a SetFocus (like OptionGroup).

> Because I think that easier to create a property for a class than create a new property for a form (if we will use different classes for forms).
>Am I right?

Matter of choice and general availability. If you are trying to solve this for this one form, why bother to rework the NavStand class? OTOH, if you'll need this elsewhere, why do it again for each form in turn - do it at the class level. You may choose to keep it in your NavStand class, or to keep it in your form class.

Though, I think your request is highly specific - if I clicked Save after the last control, I'd expect my form to move focus regularly to the topmost control, not back to the control where I was; so I don't expect this sort of behavior to be widely desirable. Well, you know your needs better than I do - it's up to you.