Sent when the user clicks on the chevron button of a CTabFolder.
<p>
The default behaviour is to show a list of items that are not currently
visible and to change the selection based on the item selected from the list.
</p>
@param event an event containing information about the show list
Sent when the user clicks on the chevron button of a CTabFolder. <p> The default behaviour is to show a list of items that are not currently visible and to change the selection based on the item selected from the list. </p>
@param event an event containing information about the show list