Chorme type tabs in C# windows application.

I am trying to create one simple C# application that will create tabs like chorme browser.

Means on clicking "+" sign it will create new tabs,

Now I want that instead of creating new tabs on clicking "+" sign,

it will create new tabs when clicking Button on first tabs

Like this

Right now I am unable to create new tabs on clicking + sign

I want to achieve same thing using Five Buttons on first tabs

For this, I am using "EasyTabs" and referring code on the following page

https://ourcodeworld.com/articles/read/574/creating-a-csharp-application-with-chrome-style-tabs-using-easytabs-in-winforms