code: function mxVisibleChange(model, cell, visible)
  {
  	this.model = model;
  	this.cell = cell;
  	this.visible = visible;
  	this.previous = visible;
  }
docs: Class: mxVisibleChange
  
  Action to change a cell's visible state in a model.
  
  Constructor: mxVisibleChange
  
  Constructs a change of a visible state in the
  specified model.