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);