Hi Alfons,
In old way, you can use setSelectedValue first and the onSelect. But in data binding, setSelectedValue is not defined according to 2193693 - Limitations of the Design Studio Property Binding Feature.
I think the output binding is kind of on click event. So it won't be triggered when first rendering. Not sure what specialconcern you have, but I will just do the filter in the initial view.
Best regards,
Alfred