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I noticed that SimpleStore isn't in the 3.0 documentation. Is this still available?
It got turned into "ArrayStore" since that naming convention made more sense.
From the docs: "Formerly known as "SimpleStore", ArrayStore is a small helper class to make creating Stores from Array data easier. ArrayStore is not pre-configured with a built-in Ext.data.DataProxy but is pre-configured with a built-in ArrayReader."
Look at the xtype list in Component. It lists the classes, xtypes, what got deprecated, etc.