Hi,
You can populate the values in the code behind - just by selecting them from the CMS_Country and CMS_State tables e.g. using SQL command.
Or, you can use the form control again, register it in the ascx:
<%@ Register Src="~/CMSFormControls/CountrySelector.ascx" TagName="CountrySelector"
TagPrefix="cms" %>
and then use it:
<cms:CountrySelector ID="countrySelector" runat="server"... />
Best regards,
Juraj Ondrus