Gets and sets the property Tier. 
            
This specifies the tier to use to update the environment.
                     Condition: You can only update the tier version for an environment. If you
            change the name of the type,          AWS Elastic Beanstalk returns  CopyC#
            error.
CopyC#
            error.      
            InvalidParameterValue
 Declaration Syntax
 Declaration Syntax| C# | 
public EnvironmentTier Tier { get; set; }