I'm using a Popup and need TestFX to click some buttons that are in the popup, but the nodes are not found. How is a Popup hooked into an existing node tree?
The code in a.o. PopupWindow seems to only reference one way; from the popup towards the owner, but not the other way. Only if the owning window is a PopupWindow is the popup added to its children. But if the owning window is a simple stage, then I see no way to get to the Popup. What I (and TestFX) would need is some way to bridge from the stage over to the popup.