Changes identified by the code review (on 13/08/2013) 

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@181854 a5903396-d722-0410-b921-86c7d4935375
Fixed the bug of not persisting message sampler state on activation-deactivation

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@181855 a5903396-d722-0410-b921-86c7d4935375
switched the location of message store combobox of message sampler processor

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@181857 a5903396-d722-0410-b921-86c7d4935375