On Monday, December 21, 2015 at 2:12:50 PM UTC+2, Paul Robinson wrote: > > You appear to be adding an item without also creating that item. That > suggests the item already exists, and is possibly already displayed. You > can't have the same widget appearing more than once. That may be your > problem. > > Paul > > > Paul, thank you for hint. I have checked the source code once again and found that my *Service and *ServiceAsync have different return types. Changing type in one place I have forgot to change in another and thus callback function actually didn't fire. After fixing it - I was able to add object to UI in asych. callback.
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