added detached widget logic

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10288 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
[perf] use native browser api for detached check

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@10289 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c