Custom Screen Populate Combo Box

I have a custom screen, Screen ID = "Configure Clock Host", that contains a combo box CTRL_COMBOBOX_01 that I want it's items to contain the names of available SQL Servers that I have contained in a table named tblSQLServers.

How do I get the names contained in the table into the combo box and cause the initial selected value to be the first server name in the list. I would like to do this in the Actions 'On Post Install' script if possible.

Thanks in advance