Sandesh,

In the DotNetNuke Source, find the file TimeZoneEditor.ascx.vb in the folder Library\Components\ControlPanel.  In it, you will find the following code for filling the "locales" dropdown:

  Private Sub BindList()
   Dim ds As New DataSet
   Dim dv As DataView

   ds.ReadXml(Server.MapPath(Localization.SupportedLocalesFile))
   dv = ds.Tables(0).DefaultView
   dv.Sort = "name ASC"

   cboLocales.DataSource = dv
   cboLocales.DataBind()
  End Sub

It may not be a cut and paste.  I was just trying to point you in the right direction.

Check your Import statements, make sure that you are importing the same things that TimeZoneEditor.ascx.vb does.  I noticed that it also inherits another module.