diff --git a/js/ui/mxgraph/src/js/util/mxObjectIdentity.js b/js/ui/mxgraph/src/js/util/mxObjectIdentity.js
new file mode 100644
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+++ b/js/ui/mxgraph/src/js/util/mxObjectIdentity.js
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+/**
+ * Copyright (c) 2006-2015, JGraph Ltd
+ * Copyright (c) 2006-2015, Gaudenz Alder
+ */
+var mxObjectIdentity =
+{
+	/**
+	 * Class: mxObjectIdentity
+	 * 
+	 * Identity for JavaScript objects and functions. This is implemented using
+	 * a simple incrementing counter which is stored in each object under
+	 * <FIELD_NAME>.
+	 * 
+	 * The identity for an object does not change during its lifecycle.
+	 * 
+	 * Variable: FIELD_NAME
+	 * 
+	 * Name of the field to be used to store the object ID. Default is
+	 * <code>mxObjectId</code>.
+	 */
+	FIELD_NAME: 'mxObjectId',
+
+	/**
+	 * Variable: counter
+	 * 
+	 * Current counter.
+	 */
+	counter: 0,
+
+	/**
+	 * Function: get
+	 * 
+	 * Returns the ID for the given object or function or null if no object
+	 * is specified.
+	 */
+	get: function(obj)
+	{
+		if (obj != null)
+		{
+			if (obj[mxObjectIdentity.FIELD_NAME] == null)
+			{
+				if (typeof obj === 'object')
+				{
+					var ctor = mxUtils.getFunctionName(obj.constructor);
+					obj[mxObjectIdentity.FIELD_NAME] = ctor + '#' + mxObjectIdentity.counter++;
+				}
+				else if (typeof obj === 'function')
+				{
+					obj[mxObjectIdentity.FIELD_NAME] = 'Function#' + mxObjectIdentity.counter++;
+				}
+			}
+			
+			return obj[mxObjectIdentity.FIELD_NAME];
+		}
+		
+		return null;
+	},
+
+	/**
+	 * Function: clear
+	 * 
+	 * Deletes the ID from the given object or function.
+	 */
+	clear: function(obj)
+	{
+		if (typeof(obj) === 'object' || typeof obj === 'function')
+		{
+			delete obj[mxObjectIdentity.FIELD_NAME];
+		}
+	}
+
+};