Child applications from dropdowns

I would like to be able to trigger a new graph when a a user clicks on a dropdown, without retriggering the data retrieval. I have seen examples of child apps that do this but they are all driven by clicks on a map. How can I do this driven from a dropdown assuming it is possible?

UPDATE: I found this example app, https://cds.climate.copernicus.eu/toolbox-editor/1485/17_dynamic_map_mask_child, but it loses the time series plot when you select from the drodown.


Cheers,

Pete