* @extends Ext.form.field.Trigger
* <p>An abstract class for fields that have a single trigger which opens a "picker" popup below
* the field, e.g. a combobox menu list or a date picker. It provides a base implementation for
* @extends Ext.form.field.Trigger
* <p>An abstract class for fields that have a single trigger which opens a "picker" popup below
* the field, e.g. a combobox menu list or a date picker. It provides a base implementation for