AMBARI-1154. The check boxes to check/uncheck one of the members in a multi artifact graphs is not very readable. It should be more apparent on which one the user clicked on. (yusaku)

git-svn-id: https://svn.apache.org/repos/asf/incubator/ambari/trunk@1431838 13f79535-47bb-0310-9956-ffa450edef68