code: function mxCellAttributeChange(cell, attribute, value)
  {
  	this.cell = cell;
  	this.attribute = attribute;
  	this.value = value;
  	this.previous = value;
  }
docs: Class: mxCellAttributeChange
  
  Action to change the attribute of a cell's user object.
  There is no method on the graph model that uses this
  action. To use the action, you can use the code shown
  in the example below.
  
  Example:
  
  To change the attributeName in the cell's user object
  to attributeValue, use the following code:
  
  (code)
  model.beginUpdate();
  try
  {
  var edit = new mxCellAttributeChange(
  cell, attributeName, attributeValue);
  model.execute(edit);
  }
  finally
  {
  model.endUpdate();
  }
  (end)
  
  Constructor: mxCellAttributeChange
  
  Constructs a change of a attribute of the DOM node
  stored as the value of the given <mxCell>.