ComboBoxBase SAP SE An abstract class for combo boxes. 1.22.0 sap.m/ComboBoxTextField Indicates whether the text values of the <code>additionalText</code> property of a {@link sap.ui.core.ListItem} are shown. This event is fired when the end user clicks the combo box button to open the dropdown list and the data used to display items is not already loaded. Alternatively, it is fired after the user moves the cursor to the combo box text field and perform an action that requires data to be loaded. For example, pressing F4 to open the dropdown list or typing something in the text field fires the event. <b>Note:</b> Use this feature in performance critical scenarios only. Loading the data lazily (on demand) to defer initialization has several implications for the end user experience. For example, the busy indicator has to be shown while the items are being loaded and assistive technology software also has to announce the state changes (which may be confusing for some screen reader users). <b>Note</b>: Currently the <code>sap.m.MultiComboBox</code> does not support this event. Defines the items contained within this control. Internal aggregation to hold the inner picker popup.