change layer depth in JLayeredPane

Hello every body,
I'm using JLayeredPane  to draw several layers, each layer has different depth 
my question is: how can i change the layer depth at run time?
i need to change the depth of previewMap from 0 to 1, and the depth of mapControlPanel from 1 to 0

JLayeredPane layeredPane = new JLayeredPane ();
JPanel previewMap = new JPanel();
JPanel mapControlPanel = new JPanel(new BorderLayout());
layeredPane.add(previewMap, Integer.valueOf(0));
layeredPane.add(mapControlPanel, Integer.valueOf(1));