A panel adds a border and label to a group of controls, and can be
minimised (either automatically to conserve space, or manually by the user).
+
+ Non ribbon controls can be placed on a panel using wxSizers to manage
+ layout. wxWrapSizer and AddStretchSpacer() are useful for proportional
+ vertical and horizontal positioning. Note that layout is done within the
+ constraints of the panel's client area and this is dictated by
+ wxRibbonArtProvider.
+
+ Mixing ribbon and non-ribbon controls in a RibbonPanel is not supported at
+ present.
@sa wxRibbonPage