I am using Ext.net.Mvc version 4.7.1. I have created a control class and derived from an ext.net container and have overridden the "XType" property but it is giving me an error. How can i use my own xtype in my custom control?

This is my code.
public override string XType => "nextextboxbrowser";
When i run the application, I get the following error...

A public action method 'widget' was not found on controller