Do you know a GUI designer for YUI or for any other rich javascript library?

The question says it all... We are shopping for a a rich javascript library and are about to choose YUI. The issue of (non)existence of a GUI designer will strongly influence our choice.

From stackoverflow

• Does the YUI CSS Grid Builder cover what you need?

  flybywire : nice, but too simple

• Andy,

  Daniel's answer is a good one for YUI CSS Grids. There is no wysiswyg editor that supports YUI widgets afaik, but this article might be of interest if you're a Dreamweaver CS4 user:

  http://www.adobe.com/devnet/dreamweaver/articles/using_yui_widgets.html

  YUI's founder, Thomas Sha, did a lot of work to make YUI's widget's more accessible to Dreamweaver users.

  Aptana has also done a lot of work to make sure that all the big JS kits are well supported. They have a good YUI plugin for 2.6.0 and are working on the 2.7.0 update:

  http://yuiblog.com/blog/2008/10/28/aptana/

  -Eric