Add dropdownMode

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11944 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
bugfix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11945 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
bugfix

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11946 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
Fix message

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11947 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c
refactor

git-svn-id: http://primefaces.googlecode.com/svn/primefaces/trunk@11948 5a70e874-a5cb-11dd-8af2-493fb0bb9f7c