>Sorry I am not getting it. Again, in my case - now - the popup form is MODELESS. As soon as the code in this, POPUP MODELESS form, calls .hide(), the method DEACTIVATE is fired. And therefore, the .tag is gone. That is, as soon as hide() fires, the code (in the debugger) goes to the READ EVENTS line.

DEACTIVATE means the form is not active, not closed. The form only closes, when you fire something closing the form in DEACTIVATE.
Try:

Public poMyForm
poMyForm = Createobject("myform")
poMyForm.Visible = .T.

Define Class myform As Form
	AutoCenter = .T.
	AllowOutput = .F.

	Procedure Activate
		?'activated'
	Endproc

	Procedure Deactivate
		?'deactivated'
	Endproc
Enddefine

Update: Run the code, click on _screen, click on form. (Do not click Toolbars or Menu, this is different)