Microsoft.Phone.Applications.UnitConverter.View.CategorySelection.OnNavigatedTo C# (CSharp) Method

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);

            if (ApplicationState.ApplicationStartup == AppOpenState.None &&
                this.pivot.Items.Count <= 1)
            {
                // We have come from the main page of the application
                this.viewModel.AllowNavigation = false;
                this.PostNavigationToInitialize();
                CategorySelectionViewModel.SyncStateToMainPageState();
                this.requestedPivotDataSelectionIndex = 
                    CategorySelectionViewModel.GetCategoryPivotIndex(pivot);
            }
            else
            {
                // Activated event case
                if (!this.IsPageActivated)
                {
                    // We are returning to the application, but we were not tomb stoned.
                    ApplicationState.ApplicationStartup = AppOpenState.None;
                    return;
                }
                this.viewModel.AllowNavigation = false;
                ApplicationState.RetrieveAppObjects(true);
                this.PostNavigationToInitialize();
                this.requestedPivotDataSelectionIndex = 
                    ApplicationState.CategoryPageInformation.PivotSelectedIndex;
                if (this.requestedPivotDataSelectionIndex == 0)
                {
                    /* If the index is 0, we don't receive an event for the pivot item
                     * changing which will cause the pivot to not render correctly.
                     * We can set the index to 1 ( normal default) without causing any
                     * problem for the pivot control. We will then set the index to 
                     * 0 later and we should get the event to fire
                     */
                    this.viewModel.SelectedDataIndex = 1;
                }
            }

            // Reenabled buttons 
            this.viewModel.AllowNavigation = true;
            pivot.Opacity = 0;
            ApplicationState.ApplicationStartup = AppOpenState.None;
        }