/// <summary>
 /// Create one IHTMLItem element, according to HTML element name passed
 /// </summary>
 /// <param name="elementName">name of the element to create</param>
 /// <param name="standardType"></param>
 /// <returns>IHTMLItem element</returns>
 public IHTMLItem CreateHTMLItem(string elementName, HTMLElementType standardType)
 {
     if (_elementsMap.ContainsKey(elementName))
     {
         Object theObj = Activator.CreateInstance(_elementsMap[elementName],standardType);
         var item = theObj as IHTMLItem;
         return item;
     }
     throw new ArgumentException(string.Format("Invalid element name {0} passed",elementName), "elementName");
 }

 /// <summary>
 /// Checks if passed standard  is valid 
 /// we need this as HTMLElementType is enumeration of [Flags] type and here we need only single value, not bitmask
 /// </summary>
 /// <param name="standardType">standard to create element according to</param>
 /// <returns>if this is valid standard</returns>
 public static bool CheckIfValidStandardArgument(HTMLElementType standardType)
 {
     if (standardType == HTMLElementType.FrameSet ||
         standardType == HTMLElementType.HTML5  ||
         standardType == HTMLElementType.Strict ||
         standardType == HTMLElementType.Transitional ||
         standardType == HTMLElementType.XHTML11 ||
         standardType == HTMLElementType.XHTML5 )
     {
         return true;
     }
     return false;
 }

        private XDocumentType GetDocumentType(HTMLElementType documentStandard)
        {
            switch (documentStandard)
            {
                case HTMLElementType.FrameSet:
                    return new XDocumentType("html", @"-//W3C//DTD XHTML 1.0 Frameset//EN",
                                             @"DTD/xhtml1-frameset.dtd", null);
                case HTMLElementType.Strict:
                    return new XDocumentType("html", @"-//W3C//DTD XHTML 1.0 Strict//EN",
                                             @"DTD/xhtml1-strict.dtd", null);
                case HTMLElementType.Transitional:
                    return new XDocumentType("html", @"-//W3C//DTD XHTML 1.0 Transitional//EN",
                                             @"DTD/xhtml1-transitional.dtd", null);
                case HTMLElementType.XHTML11:
                case HTMLElementType.XHTML5:
                    return new XDocumentType("html", @"-//W3C//DTD XHTML 1.1//EN",
                                            @"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd", null);
                case HTMLElementType.HTML5:
                    return new XDocumentType("html", null, null, null);

            }
            throw new NotImplementedException(string.Format("The case of {0} not implemented yet", documentStandard));
        }

 public Track(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public ListItem(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public Anchor(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public CodeText(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public Canvas(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public Input(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public Frameset(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public HorizontalRuler(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public BiDirectionalOverride(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public BlockQuoteElement(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public InlineFrame(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public HTMLDocument(HTMLElementType standard)
 {
     _documentStandard = standard;
     _htmlRoot = new HTML(standard);
 }

 public DefinitionList(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public DirectoryList(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public Address(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public Paragraph(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }

 public TextArea(HTMLElementType htmlStandard)
     : base(htmlStandard)
 {
 }