When a popup list is in popup the event loop is suspended or something
because I am only updating the form when I get a nil event from
EvtGetEvent().

However when a menu is active the event loop is still returning nil events
every hundreth of a second.

.My event loop looks like

EvtGetEvent()

if (not nil)
    Normal handlers like AppHandleEvent etc
else
  read sensors and update screen with new values


How does Evan's suggestion, below,  fit into it:

psuedo code:
-get active window bounds
-usual event loop
-if not delay or delay and not an update
-FrmDispatchForm( )
-if active window proper sized kill delay






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