code: function mxSelectionChange(selectionModel, added, removed)
  {
  	this.selectionModel = selectionModel;
  	this.added = (added != null) ? added.slice() : null;
  	this.removed = (removed != null) ? removed.slice() : null;
  }
docs: Class: mxSelectionChange
  
  Action to change the current root in a view.
  
  Constructor: mxCurrentRootChange
  
  Constructs a change of the current root in the given view.