Use enum instead of macro to represent flag used in wxPGPropertyGridInterface and wxPGProperty methods.

Use enums to represent all flags.

include/wx/propgrid/propgriddefs.h

@@ -319,6 +319,8 @@ WX_DEFINE_TYPEARRAY_WITH_DECL_PTR(wxObject*, wxArrayPGObject,
 
 enum wxPG_GETPROPERTYVALUES_FLAGS
 {
+/** Flags for wxPropertyGrid::SetPropertyAttribute() etc */
+wxPG_DONT_RECURSE                 = 0x00000000,
 
 /** Flags for wxPropertyGridInterface::GetPropertyValues */
 wxPG_KEEP_STRUCTURE               = 0x00000010,
@@ -339,12 +341,8 @@ wxPG_FORCE                        = 0x00000100,
     Sorting done by wxPG_AUTO_SORT option uses this.
 */
 wxPG_SORT_TOP_LEVEL_ONLY          = 0x00000200
-
 };
 
-/** Flags for wxPropertyGrid::SetPropertyAttribute() etc */
-#define wxPG_DONT_RECURSE         0x00000000
-
 // -----------------------------------------------------------------------
 
 // Misc. argument flags.