How to load combobox with values from DB?

I’ve a problem with combobox initialization. Combobox is an item within a form and it should be loaded with values from DB table at the form initialization stage. Could anybody suggest a way to do it?
Thanks in advance

You may use connector property to define server-side script that will generate xml with combo options:

You may define server-side script intsead of the static xml that is used in the sample. For example like it is done in dhtmlxSuite/dhtmlxForm/samples/06_data/05_options.html sample.

If you decide to use connector as server-side solution, you need to use ComboConnector.