Ext.ux.grid.FiltersFeature

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Hi all,
I'm new to ExtJS and I'm facing some problems with Ext.ux.grid.FiltersFeature:

var filters = {
	ftype: 'filters',
	local: false,
	filters: [{
		type: 'list',
		dataIndex: 'id_employee',
		phpMode: true,
		mode: 'local',
                store: employeeStore,
		labelField: 'fio',
		valueField: 'id'		
	}]
};

This code is correctly worked on Ext3, but not with Ext4. How can I get labelField from another store and send to server valueField?
I apologize for my bad english

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No one can help me ?