Type.registerNamespace("Sys.Extended.UI.HtmlEditor.ToolbarButtons"); Sys.Extended.UI.HtmlEditor.ToolbarButtons.Undo = function(element) { Sys.Extended.UI.HtmlEditor.ToolbarButtons.Undo.initializeBase(this, [element]); } Sys.Extended.UI.HtmlEditor.ToolbarButtons.Undo.prototype = { callMethod: function() { if(!Sys.Extended.UI.HtmlEditor.ToolbarButtons.Undo.callBaseMethod(this, "callMethod")) return false; this._designPanel.undo(); } } Sys.Extended.UI.HtmlEditor.ToolbarButtons.Undo.registerClass("Sys.Extended.UI.HtmlEditor.ToolbarButtons.Undo", Sys.Extended.UI.HtmlEditor.ToolbarButtons.MethodButton);