As you discovered, all the "pick" choices need to be on the base layer. There are some possible workarounds, though.
- Give the secondary choices an Initial state of Hidden. Then add triggers to change the appropriate secondary choices to Normal when the user clicks the corresponding primary choice. But whether or not that's doable depends on the overall layout, i.e., whether objects will fit properly.
- Another option could be to have off-slide buttons that represent the choices the user makes on the layer. In other words, each secondary choice on the layer would have a trigger that selects the corresponding off-slide button on the base. Those off-slide buttons would be included in Form View.
