iwiznia/Ext.ux.Exporter — comment on commit 7ea64bb505a29833d6803e65e67f7f4c66723678
File:  line 0
By iwiznia:

Right now I don't have the time to do it right now, but if you read the post in the sencha forums, you should have all the info you need.
Also if you make an example, make a pull request with it and I'll include it.
The basics are: configure the ext loader, include the css and js of downloadify, configure the button's properties.