Why don't GridPane, HBox, BorderPane, VBox, StackPane have Skins?

[Kevin Rushforth]

Those are layout containers, not UI controls. Given their purpose -- to 
be containers for laying out children -- it would seem odd for them to 
have skins. The ability to CSS-style a Pane should be sufficient to do 
what you want.

-- Kevin


On 4/26/2019 6:13 AM, Alex Sviridov wrote:
> I am studying JavaFX API and can't understand why GridPane, HBox, BorderPane, VBox, StackPane don't have Skins. According to Skin API doc:
>> Base class for defining the visual representation of user interface controls by defining a scene graph of nodes to represent the skin. A user interface control is abstracted behind the Skinnable interface.
> Why do JavaFX developers use skins only for controls, but not for the above panes? I am asking, because these panes also have visual representation. For example, we can set color, they have children which can be placed somehow differently etc. Could anyone explain?