Grid Bound to Empty Store in initComponent

I have a grid where the store is being bound to a reference created in the viewmodel's "stores" config.

In my grid's "initComponent", I am trying to catch some of the store's events, but it is not working because the store is a placeholder, where the storeId is "ext-empty-store" and store.isEmptyStore=true.

When does the grid's store get updated to the bound reference? Does it fire an event when that happens? Is there a different grid function that I should set up the store events on?

Thank you for the help.

Grid Bound to Empty Store in initComponent