Hi Nadya,

>I found, that if form has a private DS and in the life of the form we add some object to the screen, the Form's datasession remains open after form is closed...

That's because an object belongs to the datasession it has been created in. As long as the object lives, the datasession won't go away. After a long time I finally found a work around to that problem. Execute the command that adds the object to _SCREEN with _VFP.DoCmd(). This function always operates in the default datasession and therefore all objects created with this function also operate in the default datasession:

_VFP.DoCmd("_SCREEN.AddObject([SomeClass])")

Christof