Put the creation of all actions not stored in a member variable in a private scope by enclosing the relevant lines in a pair of curly braces. This prevents accidental usage of those actions outside their scope as it has happened with the 'Select All Messages' action that was inadvertedly 'merged' with the 'New Subfolder' action. And while trying to compile after my change I found that the 'Remove duplicates' action was also 'merged' with some other action.