Dynamic ajax-store for combobox in ExtJS 4

Question

JavaScript

A question. There is a form on ExtJS 4 (namely 4.1.), which has a lot of comboboxes. Lists of options for these comboboxes are requested from the server. The situation is complicated by the fact that the content of comboboxes depends on the object for which we open this form. That is, the link by which you can get the data for the combobox from the server becomes known to me only immediately before opening the form. Moreover, with subsequent openings of the form, this link may become different, and I don’t know in advance which one. There can be countless options.
Connoisseurs of ExtJS, please tell me how this can be done.

Answer 1

It turned out to be done like this: in the onShow function, I set the form at the store of comboboxes with the extraParams I need. It seems to work.