The Resize Plugin allows you to make a Node or a Widget resizable. It supports all the functionality of the standalone Resize utility. Additionally, resizing a widget updates the widget's height,width and x,y attributes, if they exist.

   var overlay = new Y.Overlay({
      width: "200px",
      srcNode: "#overlay",
      visible: false,
      align: {node:".example", points:["tc", "bc"]}
   });
   overlay.plug(Y.Plugin.Resize);