Success! Looks like we've fixed this one. According to our records the fix was applied for
a recent build.
[1.2 Beta] stores flyout missing stores when a store is duplicated
When you create or duplicate a new store on Ext Designer 1.2 and after switch to component tab and try to bind the store via gear->storesCombobox to some gridpanel or another componet that needs store, these combos are not getting all available stores, maybe needs a reload.
Ext Designer 1.2
ExtJS 4.x framework
We're seeing an issue only with duplicating stores. Thanks for the information.