randomisation lists not displayable in spatial tab

[GoogleCodeExporter]

What steps will reproduce the problem?
1.  Run a spatial analysis and display it.
2.  Now run a randomisation.
3.  Redisplay the spatial analysis.  

What is the expected output? What do you see instead?
The randomisation list results should be available in the combo box at the
bottom left.  It is not.  The list can still be accessed from the popup
windows.

This is due to caching of the lists to help with larger data sets when
definition queries are used.  Running the randomisation adds new lists and
these are not updated in the cached set.  

Original issue reported on code.google.com by shawnlaffan on 9 Dec 2009 at 5:23