In this chapter we've explored the features and also went through the usage of the BoxSelect combobox extension. We've learned how to configure the BoxSelect extension and its proper usage. We can see that by using Ext JS's extension feature we can easily use the full strength of the Ext JS library's ComboBox field and can add our own custom functionality to fulfill our needs.

Throughout this book we have learned the fundamentals of Ext JS plugins and extensions, we have introduced some of the popular Ext JS libraries and community provided plugins and extensions, and we have also provided several hands-on real world plugins and extensions development with proper explanations and code. We now have clear knowledge about the proper usage and development of Ext JS plugins and extensions.