* {@link Roo.bootstrap.DateField} and {@link Roo.bootstrap.ComboBox} are perfect examples of this.
* @cfg {String} triggerClass An additional CSS class used to style the trigger button. The trigger will always get the
* class 'x-form-trigger' by default and triggerClass will be <b>appended</b> if specified.
* {@link Roo.bootstrap.DateField} and {@link Roo.bootstrap.ComboBox} are perfect examples of this.
* @cfg {String} triggerClass An additional CSS class used to style the trigger button. The trigger will always get the
* class 'x-form-trigger' by default and triggerClass will be <b>appended</b> if specified.