The RadEditor for ASP.NET AJAX was intended to be as simple to configure as possible - and we decided to follow the familiar pattern of TextBox as this is in fact how the editor is used in almost all cases. The development paradigm is that the editor is a part of a larger page that has some other means of making a postback or a callback - and the editor should not interfere in it. Thus, the Submit and Cancel buttons were removed.
You can see how to add Cancel and Submit buttons in this help article: Adding the Save and Cancel Buttons to a Toolbar
If you want to disable it you can use the Enabled
property as shown in this article: Disabling RadEditor
the Telerik team