Jenkins xUnit Plug-in issue

I installed Jenkins server (on windows 7), plus xUnit plug-in in order to use UnitTest++ for the C++ project I work on.

I configure jobs scripts so that TestUnit++ produce开发者_StackOverflows reports in some directory in the workspace. But when I activate "Publish testing tools result report", then click on combobox "Add", "UnitTest-1.4", nothing happens. No line is added, nothing actually changes. Same thing with any other choice in "Add" combo box.

Do I use it correctly ? Is plug-in properly installed ? dependency issue ? Any other idea ?

Thanks

xUnit requires Jenkins 1.410 or newer according to http://blog.cloudbees.com/2012/03/xunit-plugin.html