Hi Gerritjan, On Thu, Mar 22, 2012 at 9:56 AM, Gerritjan Koekkoek <gerritjankoekkoek(a)gmail.com> wrote: You can either modify the generated sheet (just make sure you don't overwrite it when you re-edit the application class) or use the custom field display. For the later you have to edit the application class using the standard class editor (not the AppWithinMinutes one) and put some code in the "Custom Display" text area. See http://extensions.xwiki.org/xwiki/bin/view/Extension/Multiselect+custom+dis… for an example and http://xwiki.475771.n2.nabble.com/Help-with-custom-display-td508630.html for some explanations. You can also look at how the date picker is implemented using custom display. Check out AppWithinMinutes.Date page. Hope this helps, Marius