HTML5 Canvas - Nested button to move parent

I have a graphic symbol which contains a nested button.  When clicked, I want that button to move the parent graphic symbol to a location X Y.

This is not working, though the nested button gets it's pointer cursor.

this.closeLens.addEventListener("click", closeThisLens.bind(this));

function closeThisLens()
{
	this.parent.x = -200;
	this.parent.y = -850;
}