how to assign value to text box from cookie with textbox

how to assign value to text box from cookie with textmode is password
 <asp:TextBox ID="Password" CssClass="TextBox"  runat="server"></asp:TextBox>
vb.net
 CType(Login1.FindControl("Password"), TextBox).Text = cookie.Values("PWD1")
it shows me value in password textbox but when i add textmode="password"
it doesnot shows me the value.................so how i can show value in textbox whose textmode is password.
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