Looks like we can't reproduce the issue or there's a problem in the test case provided.
Problem with stores
I made a TabPanel in a ViewPort (Border Layout) and a GridPanel inside as I did it with designer 1.2 many times and then I wanted to add a store or create a store. Nothing works. Is there someting new or changed or is it a bug?
Drag out the Store which you would like to create to the Stores node in the Inspector and/or directly on the canvas as a top level component.
Originally Posted by MartinL