Sent when the user clicks on the chevron button of the CTabFolder.
A chevron appears in the CTabFolder when there are more tabs
than can be displayed at the current widget size. To select a
tab that is not currently visible, the user clicks on the
chevron and selects a tab item from a list. By default, the
CTabFolder provides a list of all the items that are not currently
visible, however, the application can provide its own list by setting
the event.doit field to <code>false</code> and displaying a selection list.
@param event an event containing information about the show list
Sent when the user clicks on the chevron button of the CTabFolder. A chevron appears in the CTabFolder when there are more tabs than can be displayed at the current widget size. To select a tab that is not currently visible, the user clicks on the chevron and selects a tab item from a list. By default, the CTabFolder provides a list of all the items that are not currently visible, however, the application can provide its own list by setting the event.doit field to <code>false</code> and displaying a selection list.
@param event an event containing information about the show list
@see CTabFolder#setSelection(CTabItem)