Hi Roman,

You cannot change DeskTop property at runtime because it's read-only. You can subclass your form and use appropriate one at runtime.

PUBLIC frm
IF (6=MESSAGEB('Desktop?',4))
	frm = CREATEOBJECT('frmDT')
ELSE
	frm = CREATEOBJECT('frm')
ENDIF	
frm.SHOW()
RETURN

DEFINE CLASS frm AS FORM
	DESKTOP=.F.
ENDDEFINE

DEFINE CLASS frmDT AS frm
	DESKTOP=.T.
ENDDEFINE

>How Change Desktop Property for New class Instance?
>In this code messagebox executes only once.Why?
>

>publ frm,frm1
>frm=CREATEO('frm')
>frm.show()
>frm1=CREATEO('frm')
>frm1.show()
>define class frm as form
>  desktop=(6=MESSAGEB('Desktop?',4))
>  visible=.T.
>endefine