Richard,

 

You can create a custom button. When people click it. It calls the following JavaScript function:

<script runat="server">
 void Page_Load(object sender, System.EventArgs e)
 {
  if(! this.IsPostBack )
  {
   Editor1.Attributes["oncommand"]="return CatchCommand(this);";
  }

  CuteEditor.ToolControl tc = Editor1.ToolControls["insertcustombutonhere"];
  if(tc!=null)
  {    
   System.Web.UI.WebControls.Image Image1 = new System.Web.UI.WebControls.Image ();
   Image1.ToolTip    = "Head 1";
   Image1.ImageUrl    = "tools.gif";
   Image1.CssClass    = "CuteEditorButton";
   SetMouseEvents(Image1);
   Image1.Attributes["onclick"]="var editdoc=CuteEditor_GetEditor(this).GetDocument(); editdoc.execCommand('formatblock', false, "Heading 1");";
   tc.Control.Controls.Add(Image1);
  }
 }
 
 void SetMouseEvents(WebControl control)
 {
  control.Attributes["onmouseover"]="CuteEditor_ButtonCommandOver(this)";
  control.Attributes["onmouseout"]="CuteEditor_ButtonCommandOut(this)";
  control.Attributes["onmousedown"]="CuteEditor_ButtonCommandDown(this)";
  control.Attributes["onmouseup"]="CuteEditor_ButtonCommandUp(this)";
  control.Attributes["ondragstart"]="CuteEditor_CancelEvent()";
 }

</script>