static/ext/src/Ext-more.js
function(o){
            for (var i = 1, a = arguments, len = a.length; i < len; i++) {
                Ext.destroy(o[a[i]]);
                delete o[a[i]];
            }
        }
function(o){
            for (var i = 1, a = arguments, len = a.length; i < len; i++) {
                Ext.destroy(o[a[i]]);
                delete o[a[i]];
            }
        }
Attempts to destroy and then remove a set of named properties of the passed object.
@param {Object} o The object (most likely a Component) who's properties you wish to destroy.
@param {String...} args One or more names of the properties to destroy and remove from the object.