down list, not just a wxListBox.
So we define a base wxComboControl which can use any control as pop down
- list and wxComboBox deriving from it which implements the standard wxWindows
+ list and wxComboBox deriving from it which implements the standard wxWidgets
combobox API. wxComboControl needs to be told somehow which control to use
and this is done by SetPopupControl(). However, we need something more than
just a wxControl in this method as, for example, we need to call