ComboBox Suggest: dataFeed url not being called

I have a combo with suggest and dataFeed point to a URL. When I activate the popup, I want the dataFeed url to get called and bring back all the available data. But instead nothing is happening and the popup is empty. I have to type something in the combo to activate the dataFeed url.

Thanks!

It looks I got it working using:

        { 
            view: 'combo',
            options: {
                view:"suggest",
                body: {
                    data: []
                }
            }, 
            on: {
                onAfterRender: webix.once(function () {
                    // .. do ajax call, get ajaxResponse
		$$(this.config.id).define("options", ajaxResponse);
	        $$(this.config.id).refresh();
                })
            }
        }