* @cfg {Boolean} append (true|false) default false
* @cfg {Boolean} autoFocus (true|false) auto focus the first item, default true
* @cfg {Boolean} tickable ComboBox with tickable selections (true|false), default false
+ * @cfg {Boolean} editNotList allow text type,but not show pull down, default false
* @cfg {String} btnPosition set the position of the trigger button (left | right) default right
* @constructor
* Create a new ComboBox.