Process a wxEVT_COMMAND_COMBOBOX_CLOSEUP event, which is generated
when the list box of the combo box disappears (closes up). This
event is only generated for the same platforms as
Process a wxEVT_COMMAND_COMBOBOX_CLOSEUP event, which is generated
when the list box of the combo box disappears (closes up). This
event is only generated for the same platforms as