[xwiki-users] Enable statistics on a virtual xwiki instance

Hi folks I would like to enable statistics on one of my virtual wikis. I've configured my xwiki.cfg like this: ----- xwiki.stats=1 xwiki.stats.default=0 ---- and now i need to enable statistics for one of my virtual wikis. In the xwiki documentation is written that you can enable statistics if you set the statistics field in Xwiki.XwikiPreferences. Quote: "A wiki can decide whether Statistics is on/off by setting the "statistics" field in XWiki.XWikiPreferences. If no such field is defined the the default value xwiki.stats.default is used. " But how can i set this field? I'm running XWiki Enterprise 1.7.21212 and can't find a statistics field in my administration panel. I also tried to edit the XWiki.XwikiPreferences page in class mode and added a boolean property called "statistics" and set the value to true. Do you have any advice for me how to enable statistics on my virtual wiki? As an alternative I could also enable stats for all of my wikis by setting the xwiki.stats.default parameter to true but i would prefer to enable the statistics just for one wiki. Thanks for your help. Regards Pascal