Its me again.
Perhaps its a facelets problem, because I switched from JSF 1.1 and JSP-view to JSF 1.2 with Facelets Template and xhtml-View and with the old Setting I had no problems.
I can't test whether onchange works with jsf 1.1 or not.
Could anyone of you test this snippet and tell me if the Tabulator jumps from the first selectOneMenu to the second?
It was my fault, I had an outputPanel with ajaxRendered=true in my template.xhtml (it sourrounded the selectOneMenus).