The correctly implemented ViewModel hierarchy in Ext 5.x MVVM applications provides for more robust, modularized and well-written large applications. Read this article to write big, yet maintainable, expandable and bugless applications.
"Hey, Saki, wait a minute. You must be kidding. Grid must have a store; it is a required configuration option." Find out if and how it is possible to have an ExtJS 5 grid without store config option.