Sergey,
The NAME option in the DO FORM command usually does the trick. You have to be careful to keep the name, MyForm, in the same scope that you reference it - it's actually an object reference, just like doing MyForm = CREATE('Form'). For instance, from the command line you create a blank form:
MODI FORM test

...then activate it:
DO FORM test NAME MyForm

...you can now enter in the command window:
test.caption = "HELLO"

... the caption will change. You can make sure the variable MyForm is scoped to any code by placing:
PUBLIC MyForm

...right before the DO FORM... command. (that's not the best way, but it works...)

HTH
Mark

>Question about form reference in run-time. I have
>a file FORM1.SCX with a form,named MYFORM. When I try
>to manipulate with a form at run-time, such as -
>? myform.caption
>or
>? _screen.myform.caption
>I got a message,that such member (MYFORM) isn't found.
>I've tried DO FORM form1 NAME myform , but the result
>is the same :( What's wrong ?