I've been looking through various DAML references but can't seem to find esri_geodatabase_folderConnectionContainer and alternative values for placeswith when defining a custom project item container in Config.DAML. I'm following the "ProConcepts Custom Items" document. I'm developing an add-in that needs to store private data in the project and am thinking a custom project item is the way to do it. If possible I'd prefer the project item not be visible to the use.