problems with event listeners on various frames

FRAME1

this.btn.addEventListener("click", clickHandler.bind(this)); - works great

FRAME2

this.btn2.addEventListener("click", clickHandler2.bind(this)); - doesn't work

I used the same code and just appended 2 - btn2 and clickHandler2.

I even created a new button btn2 (with an instance etc...)

As it didn't work I thought there may be a problem with the event listeners so I removed them

from frame1

this.btn.removeEventListener("click", clickHandler);

I'm afraid the btn2 still doesn't work on frame2.