Success! Looks like we've fixed this one. According to our records the fix was applied for
a bug in our system
a recent build.
Get Started with Designer 2.0 -- missing instruction
In the section Bind the Store data to Grid and Chart, before step 2 (auto columns), you need to select CarDataJson in the project inspector and set the 'model' attribute to carDataModel. Otherwise, trying to right-click 'grid' and use the 'Auto columns' option will generate the following error: Unable to read columns - the assigned store has no model or fields defined.
Thanks. Please post any other inconsistencies you notice in the docs.