FCKeditor_OnComplete () not executed

Hi,

I am integrating ckEditor with Extjs. After I replace the TextArea by ckeditor, I want to call FCKeditor_OnComplete() so that I can use FCKeditorAPI. But FCKeditor_OnComplete() is never been called. Do I need to place it somewhere else? Thanks in advance.

Ext.Frs.ObjectEditableHTMLField = Ext.extend(Ext.form.TextArea, {
    initComponent: function () {
        this.textAreaId = this.id;
        Ext.Frs.ObjectEditableHTMLField.superclass.initComponent.call(this);
    },

    onRender: function (ct, position) {
        Ext.Frs.ObjectEditableHTMLField.superclass.onRender.call(this, ct, position);
        this.ReplaceTextArea(this.textAreaId);
    },

   
    ReplaceTextArea: function (textAreaId) {
        CKEDITOR.replace(textAreaId);
    },
   
   FCKeditor_OnComplete: function( editorInstance )
   {
        editorInstance.Events.AttachEvent( 'OnSelectionChange', DoSomething ) ;
   }


    function DoSomething( editorInstance ){}

});
Ext.reg('frsobjecteditablehtmlfield', Ext.Frs.ObjectEditableHTMLField);