Build a Form with a Grid and a CommandButton.
On the grid add dynamicXXXX expressions.
On

CommandButton.Click
   thisform.grid.Refresh

Run:
when you click,
the Refresh cycle is done one time.
when the Click event is released,
VFP fire another refresh cycle after the form.Paint event !

THIS HAVE THREE EFFECTS:

1. BIG i cannot control the context where the Dynamics are evaluated !

2. MEDIUM if i put into the Paint event my code for implement personal graphics behaviour,
it is not the last GDI directives send to WINDOWS!

3. MEDIUM a VFP complex grid interface is slow down a lot!

The tragicomic thing.

If you put a :

CommandButton.Click
   thisform.grid.columnX.Refresh

then:
- when the columnX.Refresh line is executed, no dynamics are evaluated,
but when the Click event is released ( and VFP execute the redraw of the form ),
after the Paint event the columnX Dynamics are evaluated !