Could you add the Ext.ux classes from the Ext JS distribution directory:

   extjs-4.1.0/examples/ux/

to the Ext JS 4 included with LabKey?

Specifically, I'd like to be able to use the Ext.ux.grid.FiltersFeature for adding column filtering to Ext JS 4 grids as in this Ext JS example:

http://docs.sencha.com/ext-js/4-1/#!/example/grid-filtering/grid-filter-local.html

Thanks.

Scott