>A warning: the draw() method may not work on all computers. With many computers, VFP doesn't always allow the Windows OS to redraw the VFP screen, especially when in a rapidly executing loop or on complex forms with a number of objects on them. In these cases the Draw() method won't work (depending on the computer).
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>Using the Doevents() command will solve this problem since it causes VFP to pause while the OS redraws the VFP screen. Adding a Doevents() within a fast loop can, however, drastically slow it down so you're often better not using it.

See this FAQ Speeding up DoEvents() FAQ #7779 by David Frankenbach