We know that I solved it as follows:
I added the OnInit = "txtBody_OnInit" event to the text box:
protected void txtBody_OnInit(object sender, EventArgs e)
{
ClientScript.RegisterStartupScript(GetType(), "SetEditor", string.Format("SetEditor('{0}');", ((TextBox)sender).ClientID), true);
}
Then add tinymce initialization inside the SetEditor (theID) JavaScript editor function.
This is not an ideal answer, so if there is a better answer, I will accept it.
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