>Try this:
>

>_screen.TitleBar = 0
>SET SYSMENU OFF
>SET SYSMENU TO
>_screen.WindowState = 2
>oTimer = CREATEOBJECT([MyTimer])
>oTimer.Enabled = .t.
>READ EVENTS
>_screen.TitleBar = 1
>SET SYSMENU TO DEFAULT
>
>
>
>DEFINE CLASS MyTimer AS Timer
>  Interval = 3000
>  Enabled = .f.
>  
>  
>  PROCEDURE Timer
>      CLEAR EVENTS
>  ENDPROC
>ENDDEFINE
>

>
>And you will see that when _screen goes maximised it covers the task bar.

May be subtract the task bar height from the _screen height?