public void mousePressed() {
		if (isMouseOver() && mySketch.mouseButton == PApplet.LEFT) {
			changeLabel();
			clickedClusterId = mouseOverClusterId;

			if (mouseOverClusterId != -1) {
				MainTutorQeA.SKETCH_BOTTOM
						.updateQuestionsByCluster(mouseOverClusterId);
			}
		}
	}