wxDynamicSashSplitEvents are sent to your view by wxDynamicSashWindow whenever your view is being split by the user. It is your responsibility to handle this event by creating a new view window as a child of the wxDynamicSashWindow. wxDynamicSashWindow will automatically reparent it to the proper place in its window hierarchy.
wxDynamicSashSplitEvent(const wxDynamicSashSplitEvent& event)
wxEvent* Clone() const