popup con javascript

Juan BC <[email protected]>
Newsgroups gmane.comp.gnome.mono.hispano
Message-ID <[email protected]>

saben como abrir una pagina tipo pop up desde un webform aspx?

probe esto

string popupScript = "";
         popupScript = "<script language='javascript'>" +
                         "window.open('Lista.aspx', 'CustomPopUp', " +
                         "'width=200, height=200, menubar=no, 
resizable=no')" +
                         "</script>";
         ClientScript.RegisterStartupScript(this.GetType(), 
"PopupScript", popupScript);

pero no me anda
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