The MenuPopupView class is used to show JavaFX
The MenuPopupView class is a layer used to show JavaFX Menu instances within the user interface that will scroll out from the edge of the screen.
The PopupView class is used to show a list of Nodes within the user interface - it will appear relative to the given owner node.
The SidePopupView class is a Layer used to show a JavaFX Node that will scroll out from the edge of the screen.
Enum for side of a owner node PopupView should stick to.