Add ckeck to the timer event.

IF TYPE("_SCREEN.ActiveForm.Name") = "C" AND _SCREEN.ActiveForm.Name = "Whatever"
	Select MsgTable
	locate for !ReadMsg
	if found()
	   MainForm.Image1.Visible = .T.
	else
	   MainForm.Image1.Visible = .F.
	endif
ENDIF

>Where i must check my main form is active.
>Please more explain about your code and more guide me.
>I think it occur because i am using from an activex for showing animated gif (GIF89.dll) . i change visibility of picture.
>Thank you very much
>