docs: function mxCellMarker(graph, validColor, invalidColor, hotspot)
  {
  	mxEventSource.call(this);
  	
  	if (graph != null)
  	{
  		this.graph = graph;
  		this.validColor = (validColor != null) ? validColor : mxConstants.DEFAULT_VALID_COLOR;
  		this.invalidColor = (invalidColor != null) ? invalidColor : mxConstants.DEFAULT_INVALID_COLOR;
  		this.hotspot = (hotspot != null) ? hotspot : mxConstants.DEFAULT_HOTSPOT;
  		
  		this.highlight = new mxCellHighlight(graph);
  	}
  }