How do I open the ColorPicker Custom Colors window by clicking on an individual menu item?

I am trying to open a window ColorPicker

Custom Colors

by clicking on one of the menu items from my popup ContextMenu

.

ContextMenu contextMenu = new ContextMenu();
MenuItem menuItemBgColor = new MenuItem("Background Color");
menuItemBgColor.setOnAction(new EventHandler<ActionEvent>() {
    @Override
    public void handle(ActionEvent ae) {
        // Open ColorPicker "Custom Colors" window.
    }
});
contextMenu.getItems().add(menuItemBgColor);

      

        
        
        
      

    

However, I don't know how I can achieve this. I tried using CustomMenuItem

:

CustomMenuItem cmi = new CustomMenuItem(new ColorPicker());

      

        
        
        
      

    

... but the added color picker was "un-clickable".

What I want to achieve is to open a window Custom Colors

by clicking on a given standard MenuItem

: