The ChoiceBoxSkin has a ContextMenu popup. I want to set the font of each radio-menu-item added to the popup thanks to CSS.
I should be able to write something like:
.myChoiceBox .context-menu .radio-menu-item {
    -fx-font-size: 50px;
}
But because the context-menu is not added in the scene graph as a control child, I can't. The ChoiceBox styleclass should bet set on the ContextMenu. Doing so I could write:
.myChoiceBox .radio-menu-item {
    -fx-font-size: 50px;
}

Being able to right a simple rule such as the following one would help.
.myChoiceBox .item {
    -fx-font-size: 50px;
}