I understand what you are asking, in previous versions of the documentation we had something like this. However this turned out to be a bad idea since this is too closely linked to the actual implementation. Making internal changes to the Spec interpreter means that this documentation also needs to be updated. We don���t have the resources for that, sadly this documentation became out of date and simply wrong so we had to remove it.

So for what you are asking the code is the only reference, sorry. 

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Johan Fabry   -   http://pleiad.cl/~jfabry
PLEIAD and RyCh labs  -  Computer Science Department (DCC)  -  University of Chile

On 06 Nov 2016, at 18:23, vikenti <vikenti.potapov@gmail.com> wrote:

Maybe you can give some brief explanaition how to create Spec-compatible custom UI control? (Like TextModel or ButtonModel, etc.) How to create model class, corresponding adapter and how to process common and custom UI events (mouse\keyboard\focus ordering\changing). 
I think such guide should also be included in Spec booklet.