docs: protected JXMultiSplitPane newJXMultiSplitPane(String layoutDefinition)
  	{
  		JXMultiSplitPane msp = new JXMultiSplitPane();
  		MultiSplitLayout.Node modelRoot = newRootNode(layoutDefinition);
  		msp.getMultiSplitLayout().setModel(modelRoot);
  		msp.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4));
  		return msp;
  	}