/// <summary>
        /// Determines whether this instance is connected.
        /// </summary>
        /// <returns></returns>
        public bool IsConnected()
        {
            var dteService = Package.GetGlobalService(typeof(EnvDTE.DTE)) as EnvDTE.DTE;
            if (dteService == null)
            {
                Debug.WriteLine("[PlanWorkItemController] DTE Service is null.");
                return false;
            }

            var teamExplorer = (ITeamExplorer)(Package.GetGlobalService(typeof(ITeamExplorer)));

            teamFoundationServerExt = (dteService.GetObject("Microsoft.VisualStudio.TeamFoundation.TeamFoundationServerExt") as TeamFoundationServerExt);
            TfsClient tfsClient = new TfsClient(teamFoundationServerExt);

            return tfsClient.IsTeamProjectConnnected();
        }
        /// <summary>
        /// Called when [plan work item].
        /// </summary>
        /// <param name="workItemIds">The work item ids.</param>
        public void OnPlanWorkItem(int[] workItemIds, bool areWorkItemsSelected = true)
        {
            var dteService = Package.GetGlobalService(typeof(EnvDTE.DTE)) as EnvDTE.DTE;
            if (dteService == null)
            {
                Debug.WriteLine("[PlanWorkItemController] DTE Service is null.");
                return;
            }

            var teamExplorer = (ITeamExplorer)(Package.GetGlobalService(typeof(ITeamExplorer)));

            teamFoundationServerExt = (dteService.GetObject("Microsoft.VisualStudio.TeamFoundation.TeamFoundationServerExt") as TeamFoundationServerExt);

            TfsClient tfsClient = new TfsClient(teamFoundationServerExt);

            teamExplorer.NavigateToPage(new Guid(PlanWorkItemPage.PageId), new PlanWorkItemPageModel()
            {
                WorkItemIds = workItemIds,
                UsersAvailableForAssign = tfsClient.GetUsers(),
                ConfigurationFilePath = TFSScrumExtensionsPackage.ConfigurationFilePath,
                AvailableWorkItemTypes = tfsClient.GetWorkItemsTypes(),
                AvailableWorkItemLinkTypes = tfsClient.GetWorkItemLinkTypes(),
                TfsClient = tfsClient,
                AreWorkItemsSelected = areWorkItemsSelected
            });
        }