>Hi Jess. Thank you. But it doesn’t work properly. By the way my form – form1 is under another form2. For form2 wexists() work good. Both forms are modal and alwaysontop - .t..

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Whatever Forms include modal or non-modal, you can use _SCREEN.Forms to do:

For iX = 1 to _SCREEN.FORMCOUNT
  IF _SCREEN.FORMS[iX].Caption = [Wanted!! ;p]  && or .Name = [Certain Name], change it in Form Designer!
      _SCREEN.FORMS[iX].Show
      _SCREEN.FORMS[iX].TxtCust_No = PickUp.Cust_no

      * whatever objects inside form, you can control it here!
  Endif
EndFor

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His suggestion is okey, you should not make a Form Object,
named List1 which is NOT a list object at all, maybe other object like grid!

Then, it will not be a problem!!

To Check a property exist or not in a object (maybe form, container or other simply object like label)

IF PEMSTATUS(ThisForm, [NewProperty], 5)
....

To check the object is a container:

IF PEMSTATUS(chkObj, [SetALL], 5)