ExtJs UI Designer tool - extjs4

Is there a designer tool for ExtJs or Eclipse plugin for it?
I'm developing an interface which is completely similar to desktop environment.
http://dev.sencha.com/deploy/ext-4.0.7-gpl/examples/desktop/desktop.html
Now I'm modifying the above demo. But it is very hard and time consuming process.
Can somebody tell me about this?
Thank you!

There is Designer from Sencha: http://www.sencha.com/products/designer

Sencha Designer (Architect) should be your first choice. You can find it here. http://www.sencha.com/products/architect
however, if you just want to play around quickly here is another unofficial one for ExtJS - http://www.projectspace.nl/

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