Insertar un Calendario en ASPX

[RootK]

Ya probaste simplemente haciendo ésto:

<asp:textbox id="Txt_Bdate" runat="server" Font-Names="Arial" Font-Size="XX-Small" ForeColor="#000040" Width="64px">
</asp:textbox>
<input type="button" value="..." onclick='popUpCalendar(this, this.form.Txt_Bdate, "mm/dd/yyyy")'>

Salu2