I've got a control that uses the

_SelectedIndexChanged and postback to change what options are available to the user.

It works if I am logged into the site as admin or host, but not as an anonymous user or just a regular registered user. I am coding in C# using VWD express and it's built in web-server.

If I look at the source code server up there is a small difference (see below).

(NON-ADMIN source code - doesn't work)
    <select name="dnn:ctr369:ViewBackupAccount:_ctl0:cmbServiceLevelGroupID" onchange=" setTimeout('__doPostBack(\'dnn$ctr369$ViewBackupAccount$_ctl0$cmbServiceLevelGroupID\',\'\')', 0)" language="javascript" id="dnn_ctr369_ViewBackupAccount__ctl0_cmbServiceLevelGroupID" class="Normal">

(ADMIN source code - works)
    <select name="dnn:ctr369:ViewBackupAccount:cmbServiceLevelGroupID" onchange=" setTimeout('__doPostBack(\'dnn$ctr369$ViewBackupAccount$cmbServiceLevelGroupID\',\'\')', 0)" language="javascript" id="dnn_ctr369_ViewBackupAccount_cmbServiceLevelGroupID" class="Normal">

Does anyone know why this difference exists?

Can anyone help me fix it?