code: function(x, y) {
  		if (lang.isValue(x) && lang.isValue(y)) {
  			var ctxt = this.getContext();
  		
  			// Draw the inner bezier curve
  			ctxt.lineCap= "round";
  			ctxt.strokeStyle="green";
  			ctxt.lineWidth="3";
  
  			ctxt.lineTo(x, y);
  			ctxt.stroke();
  	   }
  	}
docs: Add a point to the RubberBand