public void ShowPreviousStep()
        {
            //if there are still steps/questions
            if (StepList.Any())
            {
                //get the last step in the list
                var lastStep = StepList.Last();

                //display it
                ShowStep(lastStep);
            }
            else
            {
                //if there are no steps remaining, call OnBackPressed
                base.OnBackPressed();
            }
        }
        public async void ShowStep(Step processFlowStep)
        {
            //either display the step or  remove it from the persisted step list
            if (processFlowStep != null)
            {
                var stepToAddRemove = processFlowStep;

                if (StepList.Contains(stepToAddRemove))
                {
                    //text/numeric/date input answers to be removed from state
                    if (stepToAddRemove.Type != (int)StepInputTypeEnum.Options)
                    {
                        //remove the saved answer from persisted state
                        StepAnswersDictionary.Remove(stepToAddRemove.Id);
                    }

                    //if it already exists in the persisted step list, remove it
                    StepList.Remove(stepToAddRemove);

                    if (StepList.Any())
                    {
                        //and get the step before it
                        stepToAddRemove = StepList.Last();
                    }
                    else
                    {
                        //if after removing and there are no more steps, go back to the previous activity
                        base.OnBackPressed();
                    }
                }
                else
                {
                    //if it doesnt exist in the persisted step list, add it
                    StepList.Add(stepToAddRemove);
                }

                //instantiate a new Step Fragment
                var    processFlowFragment = new ProcessFlowFragment();
                Bundle args = new Bundle();

                //serialize the object to a step definition string
                var processFlowString = JsonConvert.SerializeObject(stepToAddRemove);

                //pass the step string definition to the fragment in the bundle
                args.PutString(ProcessFlowStep, processFlowString);

                // if the step to be shown is a text/numeric/date input, check the dictionary for a saved answer entered previously and pass it to the fragment
                if (stepToAddRemove.Type != (int)StepInputTypeEnum.Options)
                {
                    string stepAnwer = null;
                    if (StepAnswersDictionary.TryGetValue(stepToAddRemove.Id, out stepAnwer))
                    {
                        Logger.Verbose(stepToAddRemove.HeaderText + " : Answer found in Dictionary to be shown in Fragment : " + stepAnwer);
                    }

                    args.PutString(ProcessFlowStepAnswer, stepAnwer);
                }

                processFlowFragment.Arguments = args;

                //display the fragment
                ReplaceFragment(processFlowFragment, Resource.Id.ticket_placeholder, TicketFragmentTag);
            }
        }