media/js/vendor/selectize/selectize.js
function(data) {
			var key = hash_key(data[this.settings.optgroupValueField]);
			if (!key) return false;
	
			data.$order = data.$order || ++this.order;
			this.optgroups[key] = data;
			return key;
		}
function(data) {
			var key = hash_key(data[this.settings.optgroupValueField]);
			if (!key) return false;
	
			data.$order = data.$order || ++this.order;
			this.optgroups[key] = data;
			return key;
		}
function ( data ) { var key = hash_key ( data [ this . settings . optgroupValueField ] ) ; if ( ! key ) return false ; data . $order = data . $order || ++ this . order ; this . optgroups [ key ] = data ; return key ; }
Registers an option group to the pool of option groups.

@param {object} data
@return {boolean|string}
Registers an option group to the pool of option groups .