CRM-13973 - Fix bugs in Change Selections form - admin price fields not displayed and protected property accessed causing fatal.

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* CRM-13973:
  https://issues.civicrm.org/jira/browse/CRM-13973
Merge pull request #2857 from davecivicrm/CRM-13973a

CRM-13973 - Fix bugs in Change Selections form - admin price fields not ...