ReportWizard.getPreviousStep Method
        
 Gets the name of the previous step based on the current wizard model state and the current step.
 
         
        Parameters
        
            - currentStep
            
 
            - 
                
Type: String
The current step name. 
        
        Return Value
        
Type: String
        
The name of the next step, or null if there is no next step.