Hi cris, sorry it took me so long. I have created a branch in royal-community-examples [1] with the example I told you about Drag&&Drop. It is implemented with Containers (VGroup and HGroup) but I think it could help us to make an implementation for Jewel List, for example. There may be some error because I have adapted it but it WORKS. I have realized, now working with it again, that "there is a lot of code that could be optimized" (we implemented it at the beginning of the project) but I think the idea you need is going to provide it.
The example is linked to the main view, follow it :P (if you compile, it will be the only view you see when running) Hiedra [1] https://github.com/mjesteve/royale-examples-community/tree/feature/drag-and-drop