Have you called CKEDITOR.replace('txtDESCRIPTION')
yet?
if so then oEditor.setData('test')
should do the trick.
Edit:
it appears that ckeditor.net is renaming the id
from the link in the comment bellow
You can get around the problem of controls being renamed by finding
the ClientID of the control. I put code in the codebehind to find the
control's ID and set Javascript for it. That way the code is not
affected by rearranging controls on the form. If there is more than
one editor instance on a form, simply call InsertEditorJS for each
one.
Here is the codebehind:
protected void Page_Load(object sender, EventArgs e)
{
TextBox qiiEditor = (TextBox) FormView1.FindControl("qiiTextBox");
Literal qiiJS = (Literal) FormView1.FindControl("qiiTextBoxJavascript");
InsertEditorJS(qiiEditor, qiiJS);
}
protected void InsertEditorJS(TextBox TextBoxCtl, Literal LiteralCtl)
{
LiteralCtl.Text = "<script type='Text/javascript'>";
LiteralCtl.Text += "CKEDITOR.replace('";
LiteralCtl.Text += TextBoxCtl.ClientID;
LiteralCtl.Text += "');</script>";
}