There is no information about store.autoDestroy
The documentation does not have enough information about Ext.data.Store.autoDestroy, which is used in Ext.util.Bindable.bindStore().
After destruction of the grid, the store is not destroyed automatically. If not used storeManager (if the store is created without the storeId) and not to destroy store manually, then store remains in the memory.
Maybe later it will be deleted memory manager, but for this purpose there is a Ext.data.Store.destroyStore().
If you add autoDestroy = true, on destruction of the grid is automatically called store.destroyStore(), which destroys store (cleans it, removes the listeners, etc.).
ExtJS 4.1.3 - Documentation Bug - Link not working
Link to the document mentioned here ( Inside KeyMap Section - http://docs.sencha.com/ext-js/4-1/#!/guide/keyboard_nav ) that maps which numbers correlate to which keys is dead!
"404 Not Found Error"