private void OnStars()
		{
			var pageToken = _settingsService.StreamView == StreamView.ExpandedView ? PageTokens.ExpandedStream : PageTokens.ListStream;
			var navParam = new StreamPageNavigationParameter
			{
				StreamId = SpecialTags.Starred,
				Title = Strings.Resources.StartPageHeader
			};
			_navigationService.Navigate(pageToken, navParam.ToJson());
		}
		private void OnItemClick(object args)
		{
			var clickEventArgs = (ItemClickEventArgs)args;

			var categoryItem = clickEventArgs.ClickedItem as CategoryItem;
			if (categoryItem != null)
			{
				SubscriptionsHeader = categoryItem.Title;
				TreeItems = new List<TreeItemBase>(categoryItem.Subscriptions);
				_isRoot = false;
				_categoryId = categoryItem.Id;
			}
			else
			{
				var subscriptionItem = clickEventArgs.ClickedItem as SubscriptionItem;
				if (subscriptionItem != null)
				{
					var pageToken = _settingsService.StreamView == StreamView.ExpandedView ? PageTokens.ExpandedStream : PageTokens.ListStream;
					var navParam = new StreamPageNavigationParameter
					{
						StreamId = subscriptionItem.Id,
						Title = subscriptionItem.PageTitle
					};
					_navigationService.Navigate(pageToken, navParam.ToJson());
				}
			}
		}