<%@ Register TagPrefix="ed" Namespace="OboutInc.Editor" Assembly="obout_Editor" %>

By default, in Design mode, you can use some hot keys (Ctrl-B, Ctrtl-C and so on). You can suppress using of some default hot keys and define your own hot keys. For this purpose you should use inner HotKeys collection.

Sample ASP.NET

<!-- Default Ctrl-B use (bold) is suppressed here -->

<ed:Editor id="editor" runat="server">
   <HotKeys>
      <ed:HotKey Function="altS" Alt="true" Char="s" />
      <ed:HotKey Function="null" Ctrl="true" Char="b" />
   </HotKeys>
</ed:Editor>
...
<script type="text/JavaScript">
   function altS(editor) { editor.spellCheck(); } // Spell checker is called on Alt-S pressed
</script>

See hot_keys.aspx working example in downloaded zip file.