https://www.sencha.com/blog/announcing-sencha-extangular/tree/
ExtAngular Tree Component - Sencha.com
extangulartreecomponentsencha
https://www.sencha.com/blog/what-is-angular-material-component-and-why-does-it-matter/why-extangular-is-functionally-superior/
Why ExtAngular Is Functionally Superior - Sencha.com
extangularfunctionallysuperiorsencha