This morning I started with a whole new project design (RelationPerformance.xds)
I first designed the whole screen as you can see in the xds, so I could use this as a screen design.
When I wanted to publish, I got the message that my combo's were missing stores (which is correct)
I created the stores (array stores) and in Architect the combo's showed the loaded values correctly
When I published the app and ran it I got an errormessage (me.store is undefined somewhere in the bind of the Ext Combobox component (StoreManager lookup)
After looking into older projects I noticed that the 'stores' config in the app.js is missing and not generated by Architect (I now added them myself to the app.js but of course Architect overwrites this)