Visual Studio 2013 Update 3: No C# item under installed in Add New Item dialog with MPF project

Hi guys,

I have a MPF project built to VS extension. I use Visual Studio 2013 update 3.

I want add C# items into Add New Item dialog (Ctrl-Shift-A). 

The code is in below:

protected override int AddItemToHierarchy(HierarchyAddType addType)
        {
            try
            {
                CCITracing.TraceCall();
                IVsAddProjectItemDlg addItemDialog;

                string strFilter = string.Empty;
                int iDontShowAgain;
                uint uiFlags;
                IVsProject3 project = (IVsProject3)this.ProjectMgr;

                string strBrowseLocations = Path.GetDirectoryName(this.ProjectMgr.BaseURI.Uri.LocalPath);

                System.Guid projectGuid = new Guid("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}");

                addItemDialog = this.GetService(typeof(IVsAddProjectItemDlg)) as IVsAddProjectItemDlg;
                if (addType == HierarchyAddType.AddNewItem)
                {
                    uiFlags = (uint)(__VSADDITEMFLAGS.VSADDITEM_AddNewItems | __VSADDITEMFLAGS.VSADDITEM_SuggestTemplateName | __VSADDITEMFLAGS.VSADDITEM_AllowHiddenTreeView);
                }
                else
                {
                    uiFlags = (uint)(__VSADDITEMFLAGS.VSADDITEM_AddExistingItems | __VSADDITEMFLAGS.VSADDITEM_AllowMultiSelect | __VSADDITEMFLAGS.VSADDITEM_AllowStickyFilter);
                }
                ErrorHandler.ThrowOnFailure(addItemDialog.AddProjectItemDlg(this.ID, ref projectGuid, project, uiFlags, string.Empty, string.Empty, ref strBrowseLocations, ref strFilter, out iDontShowAgain)); /*&fDontShowAgain*/
            }
            catch (Exception ex)
            {
                if (ex is NotImplementedException == false)
                    throw ex;
            }

            return VSConstants.S_OK;
        }

With previous VS version, everything work fined.

But with VS 2013 update 3, nothing appears on Installed.

I really confuse I don't know what's my wrong or it is VS2013 U3's limitation, please help me.

Thanks and best regards, David