diff --git a/samples/propgrid/propgrid.h b/samples/propgrid/propgrid.h
index 08e4ff7bc7..47d389ad32 100644
--- a/samples/propgrid/propgrid.h
+++ b/samples/propgrid/propgrid.h
@@ -13,36 +13,6 @@
 
 // -----------------------------------------------------------------------
 
-class wxAdvImageFileProperty : public wxFileProperty
-{
-    WX_PG_DECLARE_PROPERTY_CLASS(wxAdvImageFileProperty)
-public:
-
-    wxAdvImageFileProperty( const wxString& label = wxPG_LABEL,
-                            const wxString& name = wxPG_LABEL,
-                            const wxString& value = wxEmptyString );
-    virtual ~wxAdvImageFileProperty ();
-
-    virtual void OnSetValue() override;  // Override to allow image loading.
-
-    virtual bool IntToValue( wxVariant& variant, int number, int argFlags = 0 ) const override;
-    virtual bool OnEvent( wxPropertyGrid* propgrid, wxWindow* primary, wxEvent& event ) override;
-    virtual wxSize OnMeasureImage( int item ) const override;
-    virtual void OnCustomPaint( wxDC& dc,
-                                const wxRect& rect, wxPGPaintData& paintdata ) override;
-
-    void LoadThumbnails( size_t n );
-
-protected:
-    wxImage*    m_pImage; // Temporary thumbnail data.
-
-    static wxPGChoices ms_choices;
-
-    int m_index; // Index required for choice behaviour.
-};
-
-// -----------------------------------------------------------------------
-
 class wxVector3f
 {
 public: