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bool IsHTMLDataOnClipboard = Clipboard.ContainsData(DataFormats.Html);
 

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   /// <summary>
    /// Class represents nodes which are using in the diagram with some additional
    /// properties
    /// </summary>
    public class CustomNode: ShapeNode
    {
        #region Data
        NodeType m_nNodeType = NodeType.Bus;
        int m_nInpNum = 0;
        int m_nOutNum = 0;
        #endregion //Data

        #region Constructor and Helper functions
        /// <summary>
        /// Default constructor. Creates an empty object
        /// </summary>
        /// <param name="a_nNodeType">Sets the type of the node</param>
        public CustomNode(NodeType a_nNodeType): base()
        {
            m_nNodeType = a_nNodeType;
        }
        /// <summary>
        /// Copy-constructor. Creates a clone of the prototype
        /// </summary>
        /// <param name="a_Prototype"></param>
        public CustomNode(CustomNode a_Prototype): base(a_Prototype)
        {
            m_nNodeType = a_Prototype.Type;
        }
        #endregion //Constructor and Helper functions

        #region Properties
        /// <value>
        /// Gets or sets type of the Node according to enum <see cref="NodeType"/>
        /// </value>
        public NodeType Type
        {
            get { return m_nNodeType; }
            set { m_nNodeType = value; }
        }
        /// <value>
        /// Gets or sets number of inputs of the node
        /// </value>
        public int InputNumber
        {
            set { m_nInpNum = value; }
            get { return m_nInpNum; }
        }
        /// <value>
        /// Gets or sets number of outputs of the node
        /// </value>
        public int OutputNumber
        {
            set { m_nOutNum = value; }
            get { return m_nOutNum; }
        }
        #endregion //Properties

        #region Overrides
        public override DiagramItem Clone(bool clipboard)
        {
            CustomNode node = base.Clone(clipboard) as CustomNode;
            if (node != null)
            {
                node.OutputNumber = OutputNumber;
                node.Type = Type;
                node.InputNumber = InputNumber;
            }
            return node;
        }
        #endregion //Overrides
    }
 

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	  /// <summary>
	  /// Saves the item content into an XML element
	  /// </summary>
	  /// <param name="xmlElement">An XmlElement the item's data should be stored into</param>
	  /// <param name="context">An XmlPersistContext object providing contextual information about the serialization process and some helper serialization methods</param>
	  protected override void SaveToXml(System.Xml.XmlElement xmlElement, XmlPersistContext context)
	  {
		base.SaveToXml(xmlElement, context);
		context.WriteInt(OutputNumber, "OutputNumber", xmlElement);
		context.WriteInt(InputNumber, "InputNumber", xmlElement);
		context.WriteEnum(Type, "ElementType", xmlElement);
	  }
	  /// <summary>
	  /// Loads the item content from an XML element
	  /// </summary>
	  /// <param name="xmlElement">An XmlElement containing the item's data</param>
	  /// <param name="context">An XmlPersistContext object providing contextual information about the serialization process and some helper serialization methods</param>
	  protected override void LoadFromXml(System.Xml.XmlElement xmlElement, XmlPersistContext context)
	  {
		base.LoadFromXml(xmlElement, context);
		OutputNumber = context.ReadInt("OutputNumber", xmlElement);
		InputNumber = context.ReadInt("InputNumber", xmlElement);
		Type = (NodeType)context.ReadEnum("ElementType", xmlElement);
	  }