void ShowCategories(IList <Category> categories, string navigationLabel)
{
CategoriesList = new ItemsList();
foreach (Category c in categories)
{
CategoriesList.Add(new CategoryViewModel(c));
}
ImageDownloader.GetImages <Category>(categories);
IWorkflowManager workflowManager = ServiceRegistration.Get <IWorkflowManager>();
workflowManager.NavigatePushTransientAsync(
WorkflowState.CreateTransientState(Guids.WorkflowStateCategoriesName, navigationLabel, false, "categories", false, WorkflowType.Workflow),
new NavigationContextConfig());
}