>Should I use classlibrary or component to subclass?

As I said in my reply: "... you'll want a class library ..."

>How to add functionality if clicked event fired?

To implement additional event processing, override the "On" methods in your sub-classes. So, for a click, you'd do:

protected override void OnClick(EventArgs e)
{
	base.OnClick(e);
}

~~Bonnie