wxHeaderButtonParams needs complete classes.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41215 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/renderer.h

@@ -29,6 +29,10 @@ class WXDLLEXPORT wxDC;
 class WXDLLEXPORT wxWindow;
 
 #include "wx/gdicmn.h" // for wxPoint
+#include "wx/colour.h"
+#include "wx/font.h"
+#include "wx/bitmap.h"
+#include "wx/string.h"
 
 // some platforms have their own renderers, others use the generic one
 #if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXGTK__)