C# Button Shape issue -

i tried follow tutorial here don't understand how works. problem don't see button in image or that, there no button on form.

also here full source code tutorial. know how add circle buttons on form.

thank you

from comment seems have not added button form.

in form code behind in constructor add:

public form1() {      initializecomponent();       var btn = new simonbutton(); //create button      this.controls.add(btn);      //add form, positioned in location (0,0) top-left corner }