public void OpenPage(AppPageType pageType)
		{
			switch (pageType)
			{
				case AppPageType.ReactionManage:
					OpenReactionManage();
					break;
				case AppPageType.AppPolicyManage:
					OpenAppPolicyManage();
					break;
				case AppPageType.InstantAction:
					OpenInstantAction();
					break;
				case AppPageType.History:
					OpenHistory();
					break;
				case AppPageType.Settings:
					OpenSettings();
					break;
				case AppPageType.About:
					OpenAbout();
					break;
				default:
					throw new NotSupportedException("not support pagetype: " + pageType.ToString());
			}

		}
		public MenuItemViewModel(AppPageType pageType)
		{
			PageType = pageType;

		}