Export xml to Excel in Extjs4.x

i am trying to export my grid stores to excel sheet in extjs4.x. can u any one help me how to do this .iam trying with Exporterall.js but it is showing that
Uncaught TypeError: Object #<Object> has no method 'reg'---------in line -204:Exporterall.js

Sounds like that plugin is for Ext JS 3 and not Ext JS 4

Can you please help me how to approache for Export stores to excel or .csv format in extjs4.x. Is there is any plugin like (Exportall.js for Extjs 3.x) . or through xml is it possible to do same thing ....?
for example

i have an xml like below
<students>
<student>
<name>naresh</name>
<id>221015</id>
<city>bangalore</city>
</student>
<student>
<name>prasad</name>
<id>221016</id>
<city>Hyderabad</city>
</student>
</students>
now i want to export this xml to excel sheet and i need to download it.