Sample "DWGList.odcl" - how does it work?

[Peter2]

Hi,

I see the sample "DWGList.odcl" and don't see how it works. There are ..
- 2 controls
- the Combobox has no defined Event
- I see no "linking" between DWGList and Combobox (both directions)

but nevertheless: changing the selection (folder) in one control changes also the folder in the other control.

It works, but I don't know how?

Thanks for advice!