// clear the window entirely
virtual void Clear() = 0;
+ // freeze the window: don't redraw it until it is thawed
+ virtual void Freeze() { }
+
+ // thaw the window: redraw it after it had been frozen
+ virtual void Thaw() { }
+
// adjust DC for drawing on this window
virtual void PrepareDC( wxDC & WXUNUSED(dc) ) { }