ExtJS 4.0, Django and ExtDirect

Do you know if I can use this Django Ext.Direct router with ExtJS 4.0? Do you have any examples where I can find how to do it? I'm new to JavaScript programming.

Will it be easy to integrate server side form validation with ExtJS? What about file upload?

Can I use ExtJS library drawing (or charts) to draw a hall where clients can click on empty seats and purchase a tickets? Do you know any other ajax library that can help me do this easier?

Also here: http://stackoverflow.com/questions/6162302/extjs-4-0-django-and-extdirect 

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