YUI().use('overlay', 'resize-plugin', 'resize-constrain', 
          'dd-plugin', 'dd-constrain', function (Y) {
    var overlay = new Y.Overlay({
        width: 80,
        height: 80,
        x: 30,
        y: 30
    });
    overlay.plug([Y.Plugin.Resize, Y.Plugin.Drag]);
    overlay.dd.plug(Y.Plugin.DDConstrained, {
        constrain: '#test'
    });
    overlay.resize.plug(Y.Plugin.ResizeConstrained, {
        constrain: '#test',
        minWidth: 50,
        minHeight: 50
    });
    overlay.render('#test');
});