Allow reparenting wxPropertyGrid(Manager) to work; Show error and suggest calling wxPropertyGrid::OnTLPChanging() if top-level parent changed indirectly.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60989 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/manager.h

@@ -592,6 +592,7 @@ public:
     virtual void SetExtraStyle ( long exStyle );
     virtual bool SetFont ( const wxFont& font );
     virtual void SetWindowStyleFlag ( long style );
+    virtual bool Reparent( wxWindowBase *newParent );
 
 protected:
     virtual wxSize DoGetBestSize() const;