+ // get the vertical adjustment, if any, NULL otherwise
+ GtkAdjustment *GetVAdj() const;
+
+ // scroll the control by the given number of pixels, return true if the
+ // scroll position changed
+ bool DoScroll(GtkAdjustment *adj, int diff);
+
+ // Widgets that use the style->base colour for the BG colour should
+ // override this and return true.
+ virtual bool UseGTKStyleBase() const { return true; }
+
+#ifdef __WXGTK20__
+ // has the control been frozen by Freeze()?
+ bool IsFrozen() const { return m_frozenness > 0; }
+#endif
+