The RadEditor Prometheus 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 intefere in it. Thus, the Submit and Cancel buttons were removed.
You can easily implement a custom Save button in the editor (even simpler than usual, as there is CSS in the editor that will style a tool called Save for you automatically). In case you wish to go this way and want to have a Save tool on the toolbar that will submit the page and you need our help with it - please let us know and we will help you out.
Other than that, at present we do not intend to re-implement the Submit and Cancel buttons into the Prometheus editor.
the Telerik team