My TreeList is generally working. However, when a user selects a Custom Command Button, I need to populate the Model with that Group.Id key value. How is this accomplished? As shown, the "function goDetail(e)" code works. However, if I remove the comment the last 2 lines the TreeList doesn't build... of course, I don't get any feedback as to what is wrong. That would be nice. But, this is where I'm trying to pull the dataItem.Id into the Model. How can I get this to happen? Thanks.