I don't know whether there is any set rule as to what occurs next.
TSE has a gap from today's open ($3.53) which i guess will be filled when TSE goes ex div
You sort of wonder what the intraday low of $2.87 on Aug 26th was all about.
I notice via The Bull that Wilson HTM has a sell on TSE
http://www.thebull.com.au/articles/a/14030-18-share-tips---6-september-2010.html