vba courses london - Vba password checking and input mask

I have a non visible text box on my form called formpassword. I want to display an inputbox and for the characters the person types to appear as asterisks. The following code works but the password is not displayed as asterisks. Please can you tell me how I can do this?

Me.formpassword.InputMask = "password"
Me.formpassword = InputBox("Please enter password")

If formpassword <> "abc" Then
MsgBox "Incorrect password"
DoCmd.Close
Exit Sub
End If

Thanks

Sue