/// <summary>
      /// Insert a symbol on a given page
      /// </summary>
      /// <param name="page">Page where the symbol be insert</param>
      /// <param name="symbolLibraryName">Symbol library name</param>
      /// <param name="symbolName">Symbol name</param>
      /// <param name="symbolvariant">Symbol variant</param>
		public void Insert(Page page, string symbolLibraryName, string symbolName, int symbolvariant)
		{
			page.LockObject();

			SymbolLibrary symbolLibrary = new SymbolLibrary(page.Project, symbolLibraryName);
			Symbol symbol = new Symbol(symbolLibrary, symbolName);

			Function function = new Function(page.Project, symbol.Variants[symbolvariant]);
			function.Location = new PointD(200, 150);
			page.InsertSubPlacement(function);
			function.Dispose();
		}